172127830657 has 2 divisors, whose sum is σ = 172127830658. Its totient is φ = 172127830656.

The previous prime is 172127830639. The next prime is 172127830703. The reversal of 172127830657 is 756038721271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 131543310721 + 40584519936 = 362689^2 + 201456^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172127830657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172127830657.

It is not a weakly prime, because it can be changed into another prime (172122830657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86063915328 + 86063915329.

It is an arithmetic number, because the mean of its divisors is an integer number (86063915329).

Almost surely, 2^172127830657 is an apocalyptic number.

It is an amenable number.

172127830657 is a deficient number, since it is larger than the sum of its proper divisors (1).

172127830657 is an equidigital number, since it uses as much as digits as its factorization.

172127830657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 987840, while the sum is 49.

The spelling of 172127830657 in words is "one hundred seventy-two billion, one hundred twenty-seven million, eight hundred thirty thousand, six hundred fifty-seven".