521816204040 has 64 divisors (see below), whose sum is σ = 1565516453760. Its totient is φ = 139144957440.

The previous prime is 521816204029. The next prime is 521816204053. The reversal of 521816204040 is 40402618125.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 521816203992 and 521816204010.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3149757 + ... + 3311283.

It is an arithmetic number, because the mean of its divisors is an integer number (24461194590).

Almost surely, 2^521816204040 is an apocalyptic number.

It is an amenable number.

521816204040 is an abundant number, since it is smaller than the sum of its proper divisors (1043700249720).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521816204040 is a wasteful number, since it uses less digits than its factorization.

521816204040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188462 (or 188458 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 33.

The spelling of 521816204040 in words is "five hundred twenty-one billion, eight hundred sixteen million, two hundred four thousand, forty".