172426873631 has 2 divisors, whose sum is σ = 172426873632. Its totient is φ = 172426873630.

The previous prime is 172426873589. The next prime is 172426873649. The reversal of 172426873631 is 136378624271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172426873631 is a prime.

It is a super-2 number, since 2×172426873631² (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 172426873631.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172422873631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86213436815 + 86213436816.

It is an arithmetic number, because the mean of its divisors is an integer number (86213436816).

Almost surely, 2^172426873631 is an apocalyptic number.

172426873631 is a deficient number, since it is larger than the sum of its proper divisors (1).

172426873631 is an equidigital number, since it uses as much as digits as its factorization.

172426873631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2032128, while the sum is 50.

The spelling of 172426873631 in words is "one hundred seventy-two billion, four hundred twenty-six million, eight hundred seventy-three thousand, six hundred thirty-one".