172920235013 has 2 divisors, whose sum is σ = 172920235014. Its totient is φ = 172920235012.

The previous prime is 172920235009. The next prime is 172920235051. The reversal of 172920235013 is 310532029271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122197087489 + 50723147524 = 349567^2 + 225218^2 .

It is a cyclic number.

It is not a de Polignac number, because 172920235013 - 2² = 172920235009 is a prime.

It is a super-2 number, since 2×172920235013² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172920231013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86460117506 + 86460117507.

It is an arithmetic number, because the mean of its divisors is an integer number (86460117507).

Almost surely, 2^172920235013 is an apocalyptic number.

It is an amenable number.

172920235013 is a deficient number, since it is larger than the sum of its proper divisors (1).

172920235013 is an equidigital number, since it uses as much as digits as its factorization.

172920235013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 35.

The spelling of 172920235013 in words is "one hundred seventy-two billion, nine hundred twenty million, two hundred thirty-five thousand, thirteen".