666426266604 has 72 divisors (see below), whose sum is σ = 1956792653088. Its totient is φ = 187286065920.

The previous prime is 666426266599. The next prime is 666426266629. The reversal of 666426266604 is 406662624666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21661257 + ... + 21692000.

Almost surely, 2^666426266604 is an apocalyptic number.

It is an amenable number.

666426266604 is an abundant number, since it is smaller than the sum of its proper divisors (1290366386484).

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

666426266604 is a wasteful number, since it uses less digits than its factorization.

666426266604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43353335 (or 43353330 counting only the distinct ones).

The product of its (nonzero) digits is 17915904, while the sum is 54.

The spelling of 666426266604 in words is "six hundred sixty-six billion, four hundred twenty-six million, two hundred sixty-six thousand, six hundred four".