166722672555 has 24 divisors (see below), whose sum is σ = 289150392960. Its totient is φ = 88868165760.

The previous prime is 166722672551. The next prime is 166722672593. The reversal of 166722672555 is 555276227661.

166722672555 is a `hidden beast` number, since 1 + 6 + 6 + 7 + 22 + 67 + 2 + 555 = 666.

It is not a de Polignac number, because 166722672555 - 2² = 166722672551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166722672551) 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, 973986 + ... + 1132295.

It is an arithmetic number, because the mean of its divisors is an integer number (12047933040).

Almost surely, 2^166722672555 is an apocalyptic number.

166722672555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

166722672555 is a deficient number, since it is larger than the sum of its proper divisors (122427720405).

166722672555 is a wasteful number, since it uses less digits than its factorization.

166722672555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2108051 (or 2108048 counting only the distinct ones).

The product of its digits is 10584000, while the sum is 54.

The spelling of 166722672555 in words is "one hundred sixty-six billion, seven hundred twenty-two million, six hundred seventy-two thousand, five hundred fifty-five".