1680629624881 has 3 divisors (see below), whose sum is σ = 1680630921273. Its totient is φ = 1680628328490.

The previous prime is 1680629624867. The next prime is 1680629624887. The reversal of 1680629624881 is 1884269260861.

The square root of 1680629624881 is 1296391.

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 is not a de Polignac number, because 1680629624881 - 2⁹ = 1680629624369 is a prime.

It is a super-2 number, since 2×1680629624881² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1680629624887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 648196 + ... + 1944586.

It is an arithmetic number, because the mean of its divisors is an integer number (560210307091).

Almost surely, 2^{1680629624881} is an apocalyptic number.

1680629624881 is the 1296391-st square number.

1680629624881 is the 648196-th centered octagonal number.

It is an amenable number.

1680629624881 is a deficient number, since it is larger than the sum of its proper divisors (1296392).

1680629624881 is an frugal number, since it uses more digits than its factorization.

1680629624881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2592782 (or 1296391 counting only the distinct ones).

The product of its (nonzero) digits is 15925248, while the sum is 61.

The spelling of 1680629624881 in words is "one trillion, six hundred eighty billion, six hundred twenty-nine million, six hundred twenty-four thousand, eight hundred eighty-one".