666121637551732 has 48 divisors (see below), whose sum is σ = 1170279013435840. Its totient is φ = 331758822235392.

The previous prime is 666121637551687. The next prime is 666121637551753. The reversal of 666121637551732 is 237155736121666.

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, 16157391703 + ... + 16157432929.

Almost surely, 2^{666121637551732} is an apocalyptic number.

It is an amenable number.

666121637551732 is a deficient number, since it is larger than the sum of its proper divisors (504157375884108).

666121637551732 is a wasteful number, since it uses less digits than its factorization.

666121637551732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56720 (or 56718 counting only the distinct ones).

The product of its digits is 57153600, while the sum is 61.

The spelling of 666121637551732 in words is "six hundred sixty-six trillion, one hundred twenty-one billion, six hundred thirty-seven million, five hundred fifty-one thousand, seven hundred thirty-two".