521655442152 has 32 divisors (see below), whose sum is σ = 1404456960480. Its totient is φ = 160509366720.

The previous prime is 521655442151. The next prime is 521655442157. The reversal of 521655442152 is 251244556125.

It is a super-2 number, since 2×521655442152² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (521655442151) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 835985974 + ... + 835986597.

It is an arithmetic number, because the mean of its divisors is an integer number (43889280015).

Almost surely, 2^521655442152 is an apocalyptic number.

521655442152 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

521655442152 is an abundant number, since it is smaller than the sum of its proper divisors (882801518328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521655442152 is a wasteful number, since it uses less digits than its factorization.

521655442152 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1671972593 (or 1671972589 counting only the distinct ones).

The product of its digits is 480000, while the sum is 42.

Adding to 521655442152 its reverse (251244556125), we get a palindrome (772899998277).

The spelling of 521655442152 in words is "five hundred twenty-one billion, six hundred fifty-five million, four hundred forty-two thousand, one hundred fifty-two".