1875642550681 has 3 divisors (see below), whose sum is σ = 1875643920223. Its totient is φ = 1875641181140.

The previous prime is 1875642550651. The next prime is 1875642550703. The reversal of 1875642550681 is 1860552465781.

The square root of 1875642550681 is 1369541.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 54060435081 + 1821582115600 = 232509^2 + 1349660^2 .

It is not a de Polignac number, because 1875642550681 - 2⁹ = 1875642550169 is a prime.

It is a super-2 number, since 2×1875642550681² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1875642550651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 684771 + ... + 2054311.

Almost surely, 2^{1875642550681} is an apocalyptic number.

1875642550681 is the 1369541-st square number.

1875642550681 is the 684771-st centered octagonal number.

It is an amenable number.

1875642550681 is a deficient number, since it is larger than the sum of its proper divisors (1369542).

1875642550681 is an frugal number, since it uses more digits than its factorization.

1875642550681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739082 (or 1369541 counting only the distinct ones).

The product of its (nonzero) digits is 16128000, while the sum is 58.

The spelling of 1875642550681 in words is "one trillion, eight hundred seventy-five billion, six hundred forty-two million, five hundred fifty thousand, six hundred eighty-one".