66430920660 has 48 divisors (see below), whose sum is σ = 200314778496. Its totient is φ = 16352226432.

The previous prime is 66430920649. The next prime is 66430920691. The reversal of 66430920660 is 6602903466.

It is a congruent 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, 42583144 + ... + 42584703.

It is an arithmetic number, because the mean of its divisors is an integer number (4173224552).

Almost surely, 2^66430920660 is an apocalyptic number.

66430920660 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66430920660 is an abundant number, since it is smaller than the sum of its proper divisors (133883857836).

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

66430920660 is a wasteful number, since it uses less digits than its factorization.

66430920660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85167872 (or 85167870 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 42.

The spelling of 66430920660 in words is "sixty-six billion, four hundred thirty million, nine hundred twenty thousand, six hundred sixty".