165871507666 has 16 divisors (see below), whose sum is σ = 250826295168. Its totient is φ = 82264968400.

The previous prime is 165871507657. The next prime is 165871507667. The reversal of 165871507666 is 666705178561.

It is a self number, because there is not a number n which added to its sum of digits gives 165871507666.

It is not an unprimeable number, because it can be changed into a prime (165871507667) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 407020 + ... + 705271.

It is an arithmetic number, because the mean of its divisors is an integer number (15676643448).

Almost surely, 2^165871507666 is an apocalyptic number.

165871507666 is a deficient number, since it is larger than the sum of its proper divisors (84954787502).

165871507666 is a wasteful number, since it uses less digits than its factorization.

165871507666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112897.

The product of its (nonzero) digits is 12700800, while the sum is 58.

The spelling of 165871507666 in words is "one hundred sixty-five billion, eight hundred seventy-one million, five hundred seven thousand, six hundred sixty-six".