165312540566 has 16 divisors (see below), whose sum is σ = 250398290688. Its totient is φ = 81846585000.

The previous prime is 165312540521. The next prime is 165312540583. The reversal of 165312540566 is 665045213561.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2907551 + ... + 2963861.

It is an arithmetic number, because the mean of its divisors is an integer number (15649893168).

Almost surely, 2^165312540566 is an apocalyptic number.

165312540566 is a deficient number, since it is larger than the sum of its proper divisors (85085750122).

165312540566 is a wasteful number, since it uses less digits than its factorization.

165312540566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70667.

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 165312540566 in words is "one hundred sixty-five billion, three hundred twelve million, five hundred forty thousand, five hundred sixty-six".