521979132872 has 8 divisors (see below), whose sum is σ = 978710874150. Its totient is φ = 260989566432.

The previous prime is 521979132817. The next prime is 521979132877. The reversal of 521979132872 is 278231979125.

It can be written as a sum of positive squares in only one way, i.e., 486637388836 + 35341744036 = 697594^2 + 187994^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (521979132877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32623695797 + ... + 32623695812.

Almost surely, 2^521979132872 is an apocalyptic number.

It is an amenable number.

521979132872 is a deficient number, since it is larger than the sum of its proper divisors (456731741278).

521979132872 is a wasteful number, since it uses less digits than its factorization.

521979132872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65247391615 (or 65247391611 counting only the distinct ones).

The product of its digits is 3810240, while the sum is 56.

The spelling of 521979132872 in words is "five hundred twenty-one billion, nine hundred seventy-nine million, one hundred thirty-two thousand, eight hundred seventy-two".