521663012 has 48 divisors (see below), whose sum is σ = 1039113600. Its totient is φ = 227162880.

The previous prime is 521662987. The next prime is 521663029. The reversal of 521663012 is 210366125.

It is a Harshad number since it is a multiple of its sum of digits (26).

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, 276689 + ... + 278567.

It is an arithmetic number, because the mean of its divisors is an integer number (21648200).

Almost surely, 2^521663012 is an apocalyptic number.

521663012 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

521663012 is a deficient number, since it is larger than the sum of its proper divisors (517450588).

521663012 is a wasteful number, since it uses less digits than its factorization.

521663012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196 (or 2194 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 521663012 is about 22839.9433449385. The cubic root of 521663012 is about 805.0014850223.

The spelling of 521663012 in words is "five hundred twenty-one million, six hundred sixty-three thousand, twelve".