166688411087640 has 128 divisors (see below), whose sum is σ = 540766362628800. Its totient is φ = 40860740321280.

The previous prime is 166688411087533. The next prime is 166688411087657. The reversal of 166688411087640 is 46780114886661.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 221307745 + ... + 222059664.

Almost surely, 2^{166688411087640} is an apocalyptic number.

166688411087640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166688411087640 is an abundant number, since it is smaller than the sum of its proper divisors (374077951541160).

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

166688411087640 is a wasteful number, since it uses less digits than its factorization.

166688411087640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443367677 (or 443367673 counting only the distinct ones).

The product of its (nonzero) digits is 74317824, while the sum is 66.

The spelling of 166688411087640 in words is "one hundred sixty-six trillion, six hundred eighty-eight billion, four hundred eleven million, eighty-seven thousand, six hundred forty".