172890428863 has 2 divisors, whose sum is σ = 172890428864. Its totient is φ = 172890428862.

The previous prime is 172890428833. The next prime is 172890428939. The reversal of 172890428863 is 368824098271.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 172890428863 - 2²⁵ = 172856874431 is a prime.

It is a super-2 number, since 2×172890428863² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 172890428798 and 172890428807.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172890428813) 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, 86445214431 + 86445214432.

It is an arithmetic number, because the mean of its divisors is an integer number (86445214432).

Almost surely, 2^172890428863 is an apocalyptic number.

172890428863 is a deficient number, since it is larger than the sum of its proper divisors (1).

172890428863 is an equidigital number, since it uses as much as digits as its factorization.

172890428863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9289728, while the sum is 58.

The spelling of 172890428863 in words is "one hundred seventy-two billion, eight hundred ninety million, four hundred twenty-eight thousand, eight hundred sixty-three".