668779545 has 32 divisors (see below), whose sum is σ = 1226953728. Its totient is φ = 304717248.

The previous prime is 668779511. The next prime is 668779549. The reversal of 668779545 is 545977866.

668779545 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 668779545 - 2⁸ = 668779289 is a prime.

It is not an unprimeable number, because it can be changed into a prime (668779549) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21862 + ... + 42608.

It is an arithmetic number, because the mean of its divisors is an integer number (38342304).

Almost surely, 2^668779545 is an apocalyptic number.

It is an amenable number.

668779545 is a deficient number, since it is larger than the sum of its proper divisors (558174183).

668779545 is a wasteful number, since it uses less digits than its factorization.

668779545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21069.

The product of its digits is 12700800, while the sum is 57.

The square root of 668779545 is about 25860.7723202537. The cubic root of 668779545 is about 874.5023760961.

The spelling of 668779545 in words is "six hundred sixty-eight million, seven hundred seventy-nine thousand, five hundred forty-five".