16666507157 has 2 divisors, whose sum is σ = 16666507158. Its totient is φ = 16666507156.

The previous prime is 16666507063. The next prime is 16666507171. The reversal of 16666507157 is 75170566661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12220418116 + 4446089041 = 110546^2 + 66679^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16666507157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16666507757) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8333253578 + 8333253579.

It is an arithmetic number, because the mean of its divisors is an integer number (8333253579).

Almost surely, 2^16666507157 is an apocalyptic number.

It is an amenable number.

16666507157 is a deficient number, since it is larger than the sum of its proper divisors (1).

16666507157 is an equidigital number, since it uses as much as digits as its factorization.

16666507157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1587600, while the sum is 50.

The spelling of 16666507157 in words is "sixteen billion, six hundred sixty-six million, five hundred seven thousand, one hundred fifty-seven".