521216631642 has 32 divisors (see below), whose sum is σ = 1232433417600. Its totient is φ = 143783898048.

The previous prime is 521216631631. The next prime is 521216631659. The reversal of 521216631642 is 246136612125.

It is a self number, because there is not a number n which added to its sum of digits gives 521216631642.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 213962917 + ... + 213965352.

It is an arithmetic number, because the mean of its divisors is an integer number (38513544300).

Almost surely, 2^521216631642 is an apocalyptic number.

521216631642 is an abundant number, since it is smaller than the sum of its proper divisors (711216785958).

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

521216631642 is a wasteful number, since it uses less digits than its factorization.

521216631642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427928310.

The product of its digits is 103680, while the sum is 39.

The spelling of 521216631642 in words is "five hundred twenty-one billion, two hundred sixteen million, six hundred thirty-one thousand, six hundred forty-two".