521664414 has 16 divisors (see below), whose sum is σ = 1104701328. Its totient is φ = 163659392.

The previous prime is 521664391. The next prime is 521664439. The reversal of 521664414 is 414466125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2557077 + ... + 2557280.

It is an arithmetic number, because the mean of its divisors is an integer number (69043833).

Almost surely, 2^521664414 is an apocalyptic number.

521664414 is an abundant number, since it is smaller than the sum of its proper divisors (583036914).

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

521664414 is a wasteful number, since it uses less digits than its factorization.

521664414 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5114379.

The product of its digits is 23040, while the sum is 33.

The square root of 521664414 is about 22839.9740367628. The cubic root of 521664414 is about 805.0022061846.

The spelling of 521664414 in words is "five hundred twenty-one million, six hundred sixty-four thousand, four hundred fourteen".