172263518157979 has 2 divisors, whose sum is σ = 172263518157980. Its totient is φ = 172263518157978.

The previous prime is 172263518157833. The next prime is 172263518158013. The reversal of 172263518157979 is 979751815362271.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172263518157979 - 2⁴¹ = 170064494902427 is a prime.

It is not a weakly prime, because it can be changed into another prime (172263518257979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86131759078989 + 86131759078990.

It is an arithmetic number, because the mean of its divisors is an integer number (86131759078990).

Almost surely, 2^{172263518157979} is an apocalyptic number.

172263518157979 is a deficient number, since it is larger than the sum of its proper divisors (1).

172263518157979 is an equidigital number, since it uses as much as digits as its factorization.

172263518157979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 400075200, while the sum is 73.

The spelling of 172263518157979 in words is "one hundred seventy-two trillion, two hundred sixty-three billion, five hundred eighteen million, one hundred fifty-seven thousand, nine hundred seventy-nine".