666897867417072 has 40 divisors (see below), whose sum is σ = 1722820482432000. Its totient is φ = 222299161190080.

The previous prime is 666897867417011. The next prime is 666897867417121. The reversal of 666897867417072 is 270714768798666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119749297 + ... + 125194607.

It is an arithmetic number, because the mean of its divisors is an integer number (43070512060800).

Almost surely, 2^{666897867417072} is an apocalyptic number.

It is an amenable number.

666897867417072 is an abundant number, since it is smaller than the sum of its proper divisors (1055922615014928).

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

666897867417072 is a wasteful number, since it uses less digits than its factorization.

666897867417072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7996821 (or 7996815 counting only the distinct ones).

The product of its (nonzero) digits is 14338695168, while the sum is 84.

The spelling of 666897867417072 in words is "six hundred sixty-six trillion, eight hundred ninety-seven billion, eight hundred sixty-seven million, four hundred seventeen thousand, seventy-two".