521616161552 has 40 divisors (see below), whose sum is σ = 1071427828992. Its totient is φ = 245573424000.

The previous prime is 521616161543. The next prime is 521616161567. The reversal of 521616161552 is 255161616125.

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 7 ways as a sum of consecutive naturals, for example, 14193074 + ... + 14229777.

Almost surely, 2^521616161552 is an apocalyptic number.

It is an amenable number.

521616161552 is an abundant number, since it is smaller than the sum of its proper divisors (549811667440).

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

521616161552 is a wasteful number, since it uses less digits than its factorization.

521616161552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28422927 (or 28422921 counting only the distinct ones).

The product of its digits is 108000, while the sum is 41.

Adding to 521616161552 its reverse (255161616125), we get a palindrome (776777777677).

The spelling of 521616161552 in words is "five hundred twenty-one billion, six hundred sixteen million, one hundred sixty-one thousand, five hundred fifty-two".