166531322951 has 4 divisors (see below), whose sum is σ = 190321511952. Its totient is φ = 142741133952.

The previous prime is 166531322899. The next prime is 166531322989. The reversal of 166531322951 is 159223135661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 159223135661 = 1453 ⋅109582337.

It is a cyclic number.

It is not a de Polignac number, because 166531322951 - 2⁶ = 166531322887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166531321951) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11895094490 + ... + 11895094503.

It is an arithmetic number, because the mean of its divisors is an integer number (47580377988).

Almost surely, 2^166531322951 is an apocalyptic number.

166531322951 is a deficient number, since it is larger than the sum of its proper divisors (23790189001).

166531322951 is an equidigital number, since it uses as much as digits as its factorization.

166531322951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23790189000.

The product of its digits is 291600, while the sum is 44.

The spelling of 166531322951 in words is "one hundred sixty-six billion, five hundred thirty-one million, three hundred twenty-two thousand, nine hundred fifty-one".