166402541 has 2 divisors, whose sum is σ = 166402542. Its totient is φ = 166402540.

The previous prime is 166402501. The next prime is 166402549. The reversal of 166402541 is 145204661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 165225316 + 1177225 = 12854^2 + 1085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-166402541 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (166402549) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83201270 + 83201271.

It is an arithmetic number, because the mean of its divisors is an integer number (83201271).

Almost surely, 2^166402541 is an apocalyptic number.

It is an amenable number.

166402541 is a deficient number, since it is larger than the sum of its proper divisors (1).

166402541 is an equidigital number, since it uses as much as digits as its factorization.

166402541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 166402541 is about 12899.7108882331. The cubic root of 166402541 is about 550.0303465349.

The spelling of 166402541 in words is "one hundred sixty-six million, four hundred two thousand, five hundred forty-one".