666670685740 has 24 divisors (see below), whose sum is σ = 1402058261520. Its totient is φ = 266277832128.

The previous prime is 666670685683. The next prime is 666670685743. The reversal of 666670685740 is 47586076666.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (666670685743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24388635 + ... + 24415954.

It is an arithmetic number, because the mean of its divisors is an integer number (58419094230).

Almost surely, 2^666670685740 is an apocalyptic number.

It is an amenable number.

666670685740 is an abundant number, since it is smaller than the sum of its proper divisors (735387575780).

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

666670685740 is a wasteful number, since it uses less digits than its factorization.

666670685740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48805281 (or 48805279 counting only the distinct ones).

The product of its (nonzero) digits is 60963840, while the sum is 61.

The spelling of 666670685740 in words is "six hundred sixty-six billion, six hundred seventy million, six hundred eighty-five thousand, seven hundred forty".