666667407996 has 36 divisors (see below), whose sum is σ = 1689519195000. Its totient is φ = 221651198688.

The previous prime is 666667407983. The next prime is 666667408087. The reversal of 666667407996 is 699704766666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23788746 + ... + 23816753.

It is an arithmetic number, because the mean of its divisors is an integer number (46931088750).

Almost surely, 2^666667407996 is an apocalyptic number.

It is an amenable number.

666667407996 is an abundant number, since it is smaller than the sum of its proper divisors (1022851787004).

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

666667407996 is a wasteful number, since it uses less digits than its factorization.

666667407996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47605898 (or 47605893 counting only the distinct ones).

The product of its (nonzero) digits is 740710656, while the sum is 72.

The spelling of 666667407996 in words is "six hundred sixty-six billion, six hundred sixty-seven million, four hundred seven thousand, nine hundred ninety-six".