516621663 has 12 divisors (see below), whose sum is σ = 748988448. Its totient is φ = 343141920.

The previous prime is 516621643. The next prime is 516621667. The reversal of 516621663 is 366126615.

It is not a de Polignac number, because 516621663 - 2⁸ = 516621407 is a prime.

It is a super-3 number, since 3×516621663³ (a number of 27 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (516621667) 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 11 ways as a sum of consecutive naturals, for example, 103470 + ... + 108347.

It is an arithmetic number, because the mean of its divisors is an integer number (62415704).

Almost surely, 2^516621663 is an apocalyptic number.

516621663 is a deficient number, since it is larger than the sum of its proper divisors (232366785).

516621663 is a wasteful number, since it uses less digits than its factorization.

516621663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212094 (or 212091 counting only the distinct ones).

The product of its digits is 38880, while the sum is 36.

The square root of 516621663 is about 22729.3128580694. The cubic root of 516621663 is about 802.3999094897.

The spelling of 516621663 in words is "five hundred sixteen million, six hundred twenty-one thousand, six hundred sixty-three".