521646045547 has 32 divisors (see below), whose sum is σ = 578662548480. Its totient is φ = 466294752000.

The previous prime is 521646045539. The next prime is 521646045563. The reversal of 521646045547 is 745540646125.

It is not a de Polignac number, because 521646045547 - 2³ = 521646045539 is a prime.

It is a super-2 number, since 2×521646045547² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 521646045547.

It is not an unprimeable number, because it can be changed into a prime (521646045587) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 173245272 + ... + 173248282.

It is an arithmetic number, because the mean of its divisors is an integer number (18083204640).

Almost surely, 2^521646045547 is an apocalyptic number.

521646045547 is a deficient number, since it is larger than the sum of its proper divisors (57016502933).

521646045547 is a wasteful number, since it uses less digits than its factorization.

521646045547 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4035.

The product of its (nonzero) digits is 4032000, while the sum is 49.

The spelling of 521646045547 in words is "five hundred twenty-one billion, six hundred forty-six million, forty-five thousand, five hundred forty-seven".