521856401034542 has 24 divisors (see below), whose sum is σ = 929960342972064. Its totient is φ = 218894174292192.

The previous prime is 521856401034509. The next prime is 521856401034581. The reversal of 521856401034542 is 245430104658125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56649626423 + ... + 56649635634.

It is an arithmetic number, because the mean of its divisors is an integer number (38748347623836).

Almost surely, 2^{521856401034542} is an apocalyptic number.

521856401034542 is a deficient number, since it is larger than the sum of its proper divisors (408103941937522).

521856401034542 is a wasteful number, since it uses less digits than its factorization.

521856401034542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113299262120 (or 113299262113 counting only the distinct ones).

The product of its (nonzero) digits is 4608000, while the sum is 50.

The spelling of 521856401034542 in words is "five hundred twenty-one trillion, eight hundred fifty-six billion, four hundred one million, thirty-four thousand, five hundred forty-two".