166581655456 has 24 divisors (see below), whose sum is σ = 342216663264. Its totient is φ = 79669487040.

The previous prime is 166581655447. The next prime is 166581655463. The reversal of 166581655456 is 654556185661.

It is a happy number.

It is a super-2 number, since 2×166581655456² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 166581655456.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113166150 + ... + 113167621.

It is an arithmetic number, because the mean of its divisors is an integer number (14259027636).

Almost surely, 2^166581655456 is an apocalyptic number.

166581655456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

166581655456 is an abundant number, since it is smaller than the sum of its proper divisors (175635007808).

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

166581655456 is a wasteful number, since it uses less digits than its factorization.

166581655456 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226333804 (or 226333796 counting only the distinct ones).

The product of its digits is 25920000, while the sum is 58.

The spelling of 166581655456 in words is "one hundred sixty-six billion, five hundred eighty-one million, six hundred fifty-five thousand, four hundred fifty-six".