172045648979 has 2 divisors, whose sum is σ = 172045648980. Its totient is φ = 172045648978.

The previous prime is 172045648937. The next prime is 172045648993. The reversal of 172045648979 is 979846540271.

It is a strong prime.

It is an emirp because it is prime and its reverse (979846540271) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172045648979 is a prime.

It is not a weakly prime, because it can be changed into another prime (172045641979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86022824489 + 86022824490.

It is an arithmetic number, because the mean of its divisors is an integer number (86022824490).

Almost surely, 2^172045648979 is an apocalyptic number.

172045648979 is a deficient number, since it is larger than the sum of its proper divisors (1).

172045648979 is an equidigital number, since it uses as much as digits as its factorization.

172045648979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30481920, while the sum is 62.

The spelling of 172045648979 in words is "one hundred seventy-two billion, forty-five million, six hundred forty-eight thousand, nine hundred seventy-nine".