158166746991 has 24 divisors (see below), whose sum is σ = 252646604496. Its totient is φ = 94545498240.

The previous prime is 158166746971. The next prime is 158166747059. The reversal of 158166746991 is 199647661851.

158166746991 is a `hidden beast` number, since 1 + 5 + 8 + 166 + 7 + 469 + 9 + 1 = 666.

It is not a de Polignac number, because 158166746991 - 2²⁶ = 158099638127 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158166746921) 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, 10935540 + ... + 10949993.

It is an arithmetic number, because the mean of its divisors is an integer number (10526941854).

Almost surely, 2^158166746991 is an apocalyptic number.

158166746991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

158166746991 is a deficient number, since it is larger than the sum of its proper divisors (94479857505).

158166746991 is a wasteful number, since it uses less digits than its factorization.

158166746991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21885623 (or 21885620 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 63.

The spelling of 158166746991 in words is "one hundred fifty-eight billion, one hundred sixty-six million, seven hundred forty-six thousand, nine hundred ninety-one".