166792981 has 2 divisors, whose sum is σ = 166792982. Its totient is φ = 166792980.

The previous prime is 166792931. The next prime is 166793021. The reversal of 166792981 is 189297661.

166792981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 164070481 + 2722500 = 12809^2 + 1650^2 .

It is a cyclic number.

It is not a de Polignac number, because 166792981 - 2¹¹ = 166790933 is a prime.

It is a super-2 number, since 2×166792981² = 55639797021732722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166792921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83396490 + 83396491.

It is an arithmetic number, because the mean of its divisors is an integer number (83396491).

Almost surely, 2^166792981 is an apocalyptic number.

It is an amenable number.

166792981 is a deficient number, since it is larger than the sum of its proper divisors (1).

166792981 is an equidigital number, since it uses as much as digits as its factorization.

166792981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 166792981 is about 12914.8356938832. The cubic root of 166792981 is about 550.4601999548.

The spelling of 166792981 in words is "one hundred sixty-six million, seven hundred ninety-two thousand, nine hundred eighty-one".