166440311564500 has 48 divisors (see below), whose sum is σ = 366280492818240. Its totient is φ = 66067909908000.

The previous prime is 166440311564477. The next prime is 166440311564521. The reversal of 166440311564500 is 5465113044661.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1270471230 + ... + 1270602229.

It is an arithmetic number, because the mean of its divisors is an integer number (7630843600380).

Almost surely, 2^{166440311564500} is an apocalyptic number.

166440311564500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

166440311564500 is an abundant number, since it is smaller than the sum of its proper divisors (199840181253740).

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

166440311564500 is a wasteful number, since it uses less digits than its factorization.

166440311564500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2541073609 (or 2541073597 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 166440311564500 in words is "one hundred sixty-six trillion, four hundred forty billion, three hundred eleven million, five hundred sixty-four thousand, five hundred".