166415415137 has 2 divisors, whose sum is σ = 166415415138. Its totient is φ = 166415415136.

The previous prime is 166415415059. The next prime is 166415415167. The reversal of 166415415137 is 731514514661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136279843921 + 30135571216 = 369161^2 + 173596^2 .

It is a cyclic number.

It is not a de Polignac number, because 166415415137 - 2²⁴ = 166398637921 is a prime.

It is not a weakly prime, because it can be changed into another prime (166415415167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83207707568 + 83207707569.

It is an arithmetic number, because the mean of its divisors is an integer number (83207707569).

Almost surely, 2^166415415137 is an apocalyptic number.

It is an amenable number.

166415415137 is a deficient number, since it is larger than the sum of its proper divisors (1).

166415415137 is an equidigital number, since it uses as much as digits as its factorization.

166415415137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 302400, while the sum is 44.

Adding to 166415415137 its reverse (731514514661), we get a palindrome (897929929798).

The spelling of 166415415137 in words is "one hundred sixty-six billion, four hundred fifteen million, four hundred fifteen thousand, one hundred thirty-seven".