172666157 has 2 divisors, whose sum is σ = 172666158. Its totient is φ = 172666156.

The previous prime is 172666073. The next prime is 172666171. The reversal of 172666157 is 751666271.

172666157 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., 170198116 + 2468041 = 13046^2 + 1571^2 .

It is a cyclic number.

It is not a de Polignac number, because 172666157 - 2¹⁶ = 172600621 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172666177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86333078 + 86333079.

It is an arithmetic number, because the mean of its divisors is an integer number (86333079).

Almost surely, 2^172666157 is an apocalyptic number.

It is an amenable number.

172666157 is a deficient number, since it is larger than the sum of its proper divisors (1).

172666157 is an equidigital number, since it uses as much as digits as its factorization.

172666157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 41.

The square root of 172666157 is about 13140.2495029585. The cubic root of 172666157 is about 556.8468163671.

The spelling of 172666157 in words is "one hundred seventy-two million, six hundred sixty-six thousand, one hundred fifty-seven".