166974541 has 2 divisors, whose sum is σ = 166974542. Its totient is φ = 166974540.

The previous prime is 166974523. The next prime is 166974553. The reversal of 166974541 is 145479661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87497316 + 79477225 = 9354^2 + 8915^2 .

It is a cyclic number.

It is not a de Polignac number, because 166974541 - 2²⁷ = 32756813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166974571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83487270 + 83487271.

It is an arithmetic number, because the mean of its divisors is an integer number (83487271).

Almost surely, 2^166974541 is an apocalyptic number.

It is an amenable number.

166974541 is a deficient number, since it is larger than the sum of its proper divisors (1).

166974541 is an equidigital number, since it uses as much as digits as its factorization.

166974541 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 43.

The square root of 166974541 is about 12921.8629074913. The cubic root of 166974541 is about 550.6598592608.

The spelling of 166974541 in words is "one hundred sixty-six million, nine hundred seventy-four thousand, five hundred forty-one".