166523642717427 has 24 divisors (see below), whose sum is σ = 251978158660800. Its totient is φ = 105830826611328.

The previous prime is 166523642717351. The next prime is 166523642717513. The reversal of 166523642717427 is 724717246325661.

166523642717427 is a `hidden beast` number, since 1 + 6 + 6 + 5 + 2 + 36 + 427 + 174 + 2 + 7 = 666.

It is not a de Polignac number, because 166523642717427 - 2⁸ = 166523642717171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (166523642717827) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4038090898 + ... + 4038132135.

It is an arithmetic number, because the mean of its divisors is an integer number (10499089944200).

Almost surely, 2^{166523642717427} is an apocalyptic number.

166523642717427 is a deficient number, since it is larger than the sum of its proper divisors (85454515943373).

166523642717427 is a wasteful number, since it uses less digits than its factorization.

166523642717427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8076223147 (or 8076223144 counting only the distinct ones).

The product of its digits is 142248960, while the sum is 63.

The spelling of 166523642717427 in words is "one hundred sixty-six trillion, five hundred twenty-three billion, six hundred forty-two million, seven hundred seventeen thousand, four hundred twenty-seven".