172318820071 has 2 divisors, whose sum is σ = 172318820072. Its totient is φ = 172318820070.

The previous prime is 172318819997. The next prime is 172318820083. The reversal of 172318820071 is 170028813271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-172318820071 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172318890071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86159410035 + 86159410036.

It is an arithmetic number, because the mean of its divisors is an integer number (86159410036).

Almost surely, 2^172318820071 is an apocalyptic number.

172318820071 is a deficient number, since it is larger than the sum of its proper divisors (1).

172318820071 is an equidigital number, since it uses as much as digits as its factorization.

172318820071 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 40.

The spelling of 172318820071 in words is "one hundred seventy-two billion, three hundred eighteen million, eight hundred twenty thousand, seventy-one".