668702545 has 16 divisors (see below), whose sum is σ = 930768768. Its totient is φ = 451693440.

The previous prime is 668702539. The next prime is 668702603. The reversal of 668702545 is 545207866.

It is not a de Polignac number, because 668702545 - 2¹⁹ = 668178257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140236 + ... + 144925.

It is an arithmetic number, because the mean of its divisors is an integer number (58173048).

Almost surely, 2^668702545 is an apocalyptic number.

It is an amenable number.

668702545 is a deficient number, since it is larger than the sum of its proper divisors (262066223).

668702545 is a wasteful number, since it uses less digits than its factorization.

668702545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285240.

The product of its (nonzero) digits is 403200, while the sum is 43.

The square root of 668702545 is about 25859.2835360920. The cubic root of 668702545 is about 874.4688128350.

The spelling of 668702545 in words is "six hundred sixty-eight million, seven hundred two thousand, five hundred forty-five".