1745328989881 has 3 divisors (see below), whose sum is σ = 1745330310991. Its totient is φ = 1745327668772.

The previous prime is 1745328989869. The next prime is 1745328989893. The reversal of 1745328989881 is 1889898235471.

The square root of 1745328989881 is 1321109.

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 an interprime number because it is at equal distance from previous prime (1745328989869) and next prime (1745328989893).

It can be written as a sum of positive squares in only one way, i.e., 234150499881 + 1511178490000 = 483891^2 + 1229300^2 .

It is not a de Polignac number, because 1745328989881 - 2⁵ = 1745328989849 is a prime.

It is a super-2 number, since 2×1745328989881² (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 (1745328989981) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 660555 + ... + 1981663.

Almost surely, 2^{1745328989881} is an apocalyptic number.

1745328989881 is the 1321109-th square number.

1745328989881 is the 660555-th centered octagonal number.

It is an amenable number.

1745328989881 is a deficient number, since it is larger than the sum of its proper divisors (1321110).

1745328989881 is an frugal number, since it uses more digits than its factorization.

1745328989881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2642218 (or 1321109 counting only the distinct ones).

The product of its digits is 278691840, while the sum is 73.

The spelling of 1745328989881 in words is "one trillion, seven hundred forty-five billion, three hundred twenty-eight million, nine hundred eighty-nine thousand, eight hundred eighty-one".