172687158401 has 2 divisors, whose sum is σ = 172687158402. Its totient is φ = 172687158400.

The previous prime is 172687158379. The next prime is 172687158421. The reversal of 172687158401 is 104851786271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 157656643600 + 15030514801 = 397060^2 + 122599^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172687158401 is a prime.

It is a super-2 number, since 2×172687158401² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 172687158401.

It is not a weakly prime, because it can be changed into another prime (172687158421) 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, 86343579200 + 86343579201.

It is an arithmetic number, because the mean of its divisors is an integer number (86343579201).

Almost surely, 2^172687158401 is an apocalyptic number.

It is an amenable number.

172687158401 is a deficient number, since it is larger than the sum of its proper divisors (1).

172687158401 is an equidigital number, since it uses as much as digits as its factorization.

172687158401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 752640, while the sum is 50.

The spelling of 172687158401 in words is "one hundred seventy-two billion, six hundred eighty-seven million, one hundred fifty-eight thousand, four hundred one".