166566151566 has 12 divisors (see below), whose sum is σ = 360893328432. Its totient is φ = 55522050516.

The previous prime is 166566151559. The next prime is 166566151573. The reversal of 166566151566 is 665151665661.

166566151566 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 6 + 61 + 515 + 66 = 666.

It is an interprime number because it is at equal distance from previous prime (166566151559) and next prime (166566151573).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4626837526 + ... + 4626837561.

It is an arithmetic number, because the mean of its divisors is an integer number (30074444036).

Almost surely, 2^166566151566 is an apocalyptic number.

166566151566 is an abundant number, since it is smaller than the sum of its proper divisors (194327176866).

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

166566151566 is a wasteful number, since it uses less digits than its factorization.

166566151566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9253675095 (or 9253675092 counting only the distinct ones).

The product of its digits is 5832000, while the sum is 54.

The spelling of 166566151566 in words is "one hundred sixty-six billion, five hundred sixty-six million, one hundred fifty-one thousand, five hundred sixty-six".