668124815 has 16 divisors (see below), whose sum is σ = 837321408. Its totient is φ = 510825216.

The previous prime is 668124811. The next prime is 668124857. The reversal of 668124815 is 518421866.

It is not a de Polignac number, because 668124815 - 2² = 668124811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668124811) 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 15 ways as a sum of consecutive naturals, for example, 218477 + ... + 221513.

It is an arithmetic number, because the mean of its divisors is an integer number (52332588).

Almost surely, 2^668124815 is an apocalyptic number.

668124815 is a deficient number, since it is larger than the sum of its proper divisors (169196593).

668124815 is a wasteful number, since it uses less digits than its factorization.

668124815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4978.

The product of its digits is 92160, while the sum is 41.

The square root of 668124815 is about 25848.1104725278. The cubic root of 668124815 is about 874.2169058981.

The spelling of 668124815 in words is "six hundred sixty-eight million, one hundred twenty-four thousand, eight hundred fifteen".