166151581816 has 32 divisors (see below), whose sum is σ = 339960440880. Its totient is φ = 75500128000.

The previous prime is 166151581807. The next prime is 166151581831. The reversal of 166151581816 is 618185151661.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 166151581816.

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, 3235 + ... + 576466.

Almost surely, 2^166151581816 is an apocalyptic number.

It is an amenable number.

166151581816 is an abundant number, since it is smaller than the sum of its proper divisors (173808859064).

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

166151581816 is a wasteful number, since it uses less digits than its factorization.

166151581816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 582975 (or 582971 counting only the distinct ones).

The product of its digits is 345600, while the sum is 49.

The spelling of 166151581816 in words is "one hundred sixty-six billion, one hundred fifty-one million, five hundred eighty-one thousand, eight hundred sixteen".