521463654164 has 24 divisors (see below), whose sum is σ = 944308297800. Its totient is φ = 251666602880.

The previous prime is 521463654053. The next prime is 521463654203. The reversal of 521463654164 is 461456364125.

It can be written as a sum of positive squares in 4 ways, for example, as 85414738564 + 436048915600 = 292258^2 + 660340^2 .

It is a super-2 number, since 2×521463654164² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270107 + ... + 1056354.

It is an arithmetic number, because the mean of its divisors is an integer number (39346179075).

Almost surely, 2^521463654164 is an apocalyptic number.

It is an amenable number.

521463654164 is a deficient number, since it is larger than the sum of its proper divisors (422844643636).

521463654164 is a wasteful number, since it uses less digits than its factorization.

521463654164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329883 (or 1329881 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 47.

The spelling of 521463654164 in words is "five hundred twenty-one billion, four hundred sixty-three million, six hundred fifty-four thousand, one hundred sixty-four".