521862842078644 has 96 divisors (see below), whose sum is σ = 1040948394393600. Its totient is φ = 226602728626560.

The previous prime is 521862842078609. The next prime is 521862842078681. The reversal of 521862842078644 is 446870248268125.

It is a self number, because there is not a number n which added to its sum of digits gives 521862842078644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7343009142 + ... + 7343080210.

It is an arithmetic number, because the mean of its divisors is an integer number (10843212441600).

Almost surely, 2^{521862842078644} is an apocalyptic number.

It is an amenable number.

521862842078644 is a deficient number, since it is larger than the sum of its proper divisors (519085552314956).

521862842078644 is a wasteful number, since it uses less digits than its factorization.

521862842078644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80413 (or 80411 counting only the distinct ones).

The product of its (nonzero) digits is 330301440, while the sum is 67.

The spelling of 521862842078644 in words is "five hundred twenty-one trillion, eight hundred sixty-two billion, eight hundred forty-two million, seventy-eight thousand, six hundred forty-four".