521364663 has 6 divisors (see below), whose sum is σ = 753082304. Its totient is φ = 347576436.

The previous prime is 521364661. The next prime is 521364671. The reversal of 521364663 is 366463125.

521364663 is a `hidden beast` number, since 5 + 2 + 1 + 3 + 646 + 6 + 3 = 666.

It is not a de Polignac number, because 521364663 - 2¹ = 521364661 is a prime.

It is a super-2 number, since 2×521364663² = 543642223650207138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521364661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 28964695 + ... + 28964712.

Almost surely, 2^521364663 is an apocalyptic number.

521364663 is a deficient number, since it is larger than the sum of its proper divisors (231717641).

521364663 is a wasteful number, since it uses less digits than its factorization.

521364663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57929413 (or 57929410 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 521364663 is about 22833.4111117897. The cubic root of 521364663 is about 804.8479905356.

The spelling of 521364663 in words is "five hundred twenty-one million, three hundred sixty-four thousand, six hundred sixty-three".