667904040418 has 16 divisors (see below), whose sum is σ = 1006333390296. Its totient is φ = 332460083200.

The previous prime is 667904040359. The next prime is 667904040443. The reversal of 667904040418 is 814040409766.

It can be written as a sum of positive squares in 4 ways, for example, as 652600618569 + 15303421849 = 807837^2 + 123707^2 .

It is a super-2 number, since 2×667904040418² (a number of 24 digits) contains 22 as substring.

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, 2579730 + ... + 2826802.

Almost surely, 2^667904040418 is an apocalyptic number.

667904040418 is a deficient number, since it is larger than the sum of its proper divisors (338429349878).

667904040418 is a wasteful number, since it uses less digits than its factorization.

667904040418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 253109.

The product of its (nonzero) digits is 1161216, while the sum is 49.

The spelling of 667904040418 in words is "six hundred sixty-seven billion, nine hundred four million, forty thousand, four hundred eighteen".