166440311564545 has 32 divisors (see below), whose sum is σ = 208617325493760. Its totient is φ = 127237734074880.

The previous prime is 166440311564521. The next prime is 166440311564563. The reversal of 166440311564545 is 545465113044661.

It is a de Polignac number, because none of the positive numbers 2^k-166440311564545 is a prime.

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, 515259685 + ... + 515582605.

It is an arithmetic number, because the mean of its divisors is an integer number (6519291421680).

Almost surely, 2^{166440311564545} is an apocalyptic number.

It is an amenable number.

166440311564545 is a deficient number, since it is larger than the sum of its proper divisors (42177013929215).

166440311564545 is a wasteful number, since it uses less digits than its factorization.

166440311564545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 327345.

The product of its (nonzero) digits is 20736000, while the sum is 55.

The spelling of 166440311564545 in words is "one hundred sixty-six trillion, four hundred forty billion, three hundred eleven million, five hundred sixty-four thousand, five hundred forty-five".