166991791344 has 40 divisors (see below), whose sum is σ = 493023384960. Its totient is φ = 47711940288.

The previous prime is 166991791327. The next prime is 166991791363. The reversal of 166991791344 is 443197199661.

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, 248499354 + ... + 248500025.

It is an arithmetic number, because the mean of its divisors is an integer number (12325584624).

Almost surely, 2^166991791344 is an apocalyptic number.

166991791344 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

166991791344 is an abundant number, since it is smaller than the sum of its proper divisors (326031593616).

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

166991791344 is a wasteful number, since it uses less digits than its factorization.

166991791344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496999397 (or 496999391 counting only the distinct ones).

The product of its digits is 8817984, while the sum is 60.

The spelling of 166991791344 in words is "one hundred sixty-six billion, nine hundred ninety-one million, seven hundred ninety-one thousand, three hundred forty-four".