668660100 has 36 divisors (see below), whose sum is σ = 1934657424. Its totient is φ = 178309280.

The previous prime is 668660093. The next prime is 668660107. The reversal of 668660100 is 1066866.

It is an interprime number because it is at equal distance from previous prime (668660093) and next prime (668660107).

It is not an unprimeable number, because it can be changed into a prime (668660107) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1114134 + ... + 1114733.

It is an arithmetic number, because the mean of its divisors is an integer number (53740484).

Almost surely, 2^668660100 is an apocalyptic number.

668660100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

668660100 is an abundant number, since it is smaller than the sum of its proper divisors (1265997324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

668660100 is a wasteful number, since it uses less digits than its factorization.

668660100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228884 (or 2228877 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 668660100 is about 25858.4628313440. The cubic root of 668660100 is about 874.4503105306.

The spelling of 668660100 in words is "six hundred sixty-eight million, six hundred sixty thousand, one hundred".