102855545521 has 9 divisors (see below), whose sum is σ = 106534223211. Its totient is φ = 99299822664.

The previous prime is 102855545489. The next prime is 102855545531. The reversal of 102855545521 is 125545558201.

The square root of 102855545521 is 320711.

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

It can be written as a sum of positive squares in only one way, i.e., 53934953121 + 48920592400 = 232239^2 + 221180^2 .

It is not a de Polignac number, because 102855545521 - 2⁵ = 102855545489 is a prime.

It is a super-2 number, since 2×102855545521² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102855545531) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9295090 + ... + 9306148.

Almost surely, 2^102855545521 is an apocalyptic number.

102855545521 is the 320711-st square number.

102855545521 is the 160356-th centered octagonal number.

It is an amenable number.

102855545521 is a deficient number, since it is larger than the sum of its proper divisors (3678677690).

102855545521 is an frugal number, since it uses more digits than its factorization.

102855545521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22176 (or 11088 counting only the distinct ones).

The product of its (nonzero) digits is 400000, while the sum is 43.

The spelling of 102855545521 in words is "one hundred two billion, eight hundred fifty-five million, five hundred forty-five thousand, five hundred twenty-one".