166939757971 has 8 divisors (see below), whose sum is σ = 202011135840. Its totient is φ = 134674090368.

The previous prime is 166939757953. The next prime is 166939757977. The reversal of 166939757971 is 179757939661.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 166939757971 - 2⁵ = 166939757939 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 166939757971.

It is not an unprimeable number, because it can be changed into a prime (166939757977) 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, 701427436 + ... + 701427673.

It is an arithmetic number, because the mean of its divisors is an integer number (25251391980).

Almost surely, 2^166939757971 is an apocalyptic number.

166939757971 is a deficient number, since it is larger than the sum of its proper divisors (35071377869).

166939757971 is a wasteful number, since it uses less digits than its factorization.

166939757971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1402855133.

The product of its digits is 135025380, while the sum is 70.

The spelling of 166939757971 in words is "one hundred sixty-six billion, nine hundred thirty-nine million, seven hundred fifty-seven thousand, nine hundred seventy-one".