668532777 has 16 divisors (see below), whose sum is σ = 973244160. Its totient is φ = 404824400.

The previous prime is 668532707. The next prime is 668532791. The reversal of 668532777 is 777235866.

It is a cyclic number.

It is not a de Polignac number, because 668532777 - 2⁷ = 668532649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668532707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33502 + ... + 49592.

It is an arithmetic number, because the mean of its divisors is an integer number (60827760).

Almost surely, 2^668532777 is an apocalyptic number.

It is an amenable number.

668532777 is a deficient number, since it is larger than the sum of its proper divisors (304711383).

668532777 is a wasteful number, since it uses less digits than its factorization.

668532777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17364.

The product of its digits is 2963520, while the sum is 51.

The square root of 668532777 is about 25856.0007928527. Note that the first 3 decimals coincide. The cubic root of 668532777 is about 874.3948041508.

The spelling of 668532777 in words is "six hundred sixty-eight million, five hundred thirty-two thousand, seven hundred seventy-seven".