668696554 has 16 divisors (see below), whose sum is σ = 1015603200. Its totient is φ = 330188400.

The previous prime is 668696537. The next prime is 668696573. The reversal of 668696554 is 455696866.

It is a junction number, because it is equal to n+sod(n) for n = 668696495 and 668696504.

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, 45847 + ... + 58645.

It is an arithmetic number, because the mean of its divisors is an integer number (63475200).

Almost surely, 2^668696554 is an apocalyptic number.

668696554 is a deficient number, since it is larger than the sum of its proper divisors (346906646).

668696554 is a wasteful number, since it uses less digits than its factorization.

668696554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13125.

The product of its digits is 9331200, while the sum is 55.

The square root of 668696554 is about 25859.1676973564. The cubic root of 668696554 is about 874.4662013309.

The spelling of 668696554 in words is "six hundred sixty-eight million, six hundred ninety-six thousand, five hundred fifty-four".