66430431666 has 48 divisors (see below), whose sum is σ = 149294597088. Its totient is φ = 22138855200.

The previous prime is 66430431653. The next prime is 66430431673. The reversal of 66430431666 is 66613403466.

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, 2949006 + ... + 2971446.

It is an arithmetic number, because the mean of its divisors is an integer number (3110304106).

Almost surely, 2^66430431666 is an apocalyptic number.

66430431666 is an abundant number, since it is smaller than the sum of its proper divisors (82864165422).

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

66430431666 is a wasteful number, since it uses less digits than its factorization.

66430431666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28549 (or 28537 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 45.

The spelling of 66430431666 in words is "sixty-six billion, four hundred thirty million, four hundred thirty-one thousand, six hundred sixty-six".