172720454327 has 2 divisors, whose sum is σ = 172720454328. Its totient is φ = 172720454326.

The previous prime is 172720454299. The next prime is 172720454353. The reversal of 172720454327 is 723454027271.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 172720454327 - 2²⁰ = 172719405751 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (172720454227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86360227163 + 86360227164.

It is an arithmetic number, because the mean of its divisors is an integer number (86360227164).

Almost surely, 2^172720454327 is an apocalyptic number.

172720454327 is a deficient number, since it is larger than the sum of its proper divisors (1).

172720454327 is an equidigital number, since it uses as much as digits as its factorization.

172720454327 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 658560, while the sum is 44.

The spelling of 172720454327 in words is "one hundred seventy-two billion, seven hundred twenty million, four hundred fifty-four thousand, three hundred twenty-seven".