166440256554 has 64 divisors (see below), whose sum is σ = 403691839488. Its totient is φ = 45054878400.

The previous prime is 166440256531. The next prime is 166440256613. The reversal of 166440256554 is 455652044661.

It is a happy number.

It is a super-2 number, since 2×166440256554² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3102214 + ... + 3155409.

It is an arithmetic number, because the mean of its divisors is an integer number (6307684992).

Almost surely, 2^166440256554 is an apocalyptic number.

166440256554 is an abundant number, since it is smaller than the sum of its proper divisors (237251582934).

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

166440256554 is a wasteful number, since it uses less digits than its factorization.

166440256554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6257683.

The product of its (nonzero) digits is 3456000, while the sum is 48.

The spelling of 166440256554 in words is "one hundred sixty-six billion, four hundred forty million, two hundred fifty-six thousand, five hundred fifty-four".