521545545125 has 16 divisors (see below), whose sum is σ = 710060554944. Its totient is φ = 379305850000.

The previous prime is 521545545119. The next prime is 521545545139.

It is a happy number.

521545545125 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 521545545125 - 2²⁴ = 521528767909 is a prime.

It is a super-2 number, since 2×521545545125² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 189651551 + ... + 189654300.

It is an arithmetic number, because the mean of its divisors is an integer number (44378784684).

Almost surely, 2^521545545125 is an apocalyptic number.

521545545125 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

521545545125 is a deficient number, since it is larger than the sum of its proper divisors (188515009819).

521545545125 is a wasteful number, since it uses less digits than its factorization.

521545545125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379305877 (or 379305867 counting only the distinct ones).

The product of its digits is 1000000, while the sum is 44.

The spelling of 521545545125 in words is "five hundred twenty-one billion, five hundred forty-five million, five hundred forty-five thousand, one hundred twenty-five".