166688411087639 has 24 divisors (see below), whose sum is σ = 194329581636528. Its totient is φ = 142561380151680.

The previous prime is 166688411087533. The next prime is 166688411087657. The reversal of 166688411087639 is 936780114886661.

It is a de Polignac number, because none of the positive numbers 2^k-166688411087639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166688411387639) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 401915699 + ... + 402330219.

It is an arithmetic number, because the mean of its divisors is an integer number (8097065901522).

Almost surely, 2^{166688411087639} is an apocalyptic number.

166688411087639 is a deficient number, since it is larger than the sum of its proper divisors (27641170548889).

166688411087639 is a wasteful number, since it uses less digits than its factorization.

166688411087639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432575 (or 432568 counting only the distinct ones).

The product of its (nonzero) digits is 501645312, while the sum is 74.

The spelling of 166688411087639 in words is "one hundred sixty-six trillion, six hundred eighty-eight billion, four hundred eleven million, eighty-seven thousand, six hundred thirty-nine".