172920235051 has 2 divisors, whose sum is σ = 172920235052. Its totient is φ = 172920235050.

The previous prime is 172920235013. The next prime is 172920235067. The reversal of 172920235051 is 150532029271.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172920235051 - 2²⁷ = 172786017323 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 172920235051.

It is not a weakly prime, because it can be changed into another prime (172920233051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86460117525 + 86460117526.

It is an arithmetic number, because the mean of its divisors is an integer number (86460117526).

Almost surely, 2^172920235051 is an apocalyptic number.

172920235051 is a deficient number, since it is larger than the sum of its proper divisors (1).

172920235051 is an equidigital number, since it uses as much as digits as its factorization.

172920235051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 172920235051 in words is "one hundred seventy-two billion, nine hundred twenty million, two hundred thirty-five thousand, fifty-one".