668045690 has 32 divisors (see below), whose sum is σ = 1298094336. Its totient is φ = 246070080.

The previous prime is 668045689. The next prime is 668045699. The reversal of 668045690 is 96540866.

It is a super-2 number, since 2×668045690² = 892570087855152200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (668045699) 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, 50069 + ... + 61991.

It is an arithmetic number, because the mean of its divisors is an integer number (40565448).

Almost surely, 2^668045690 is an apocalyptic number.

668045690 is a deficient number, since it is larger than the sum of its proper divisors (630048646).

668045690 is a wasteful number, since it uses less digits than its factorization.

668045690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12374.

The product of its (nonzero) digits is 311040, while the sum is 44.

The square root of 668045690 is about 25846.5798511138. The cubic root of 668045690 is about 874.1823938120.

The spelling of 668045690 in words is "six hundred sixty-eight million, forty-five thousand, six hundred ninety".