172466599903721 has 2 divisors, whose sum is σ = 172466599903722. Its totient is φ = 172466599903720.

The previous prime is 172466599903699. The next prime is 172466599903729. The reversal of 172466599903721 is 127309995664271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108936709425625 + 63529890478096 = 10437275^2 + 7970564^2 .

It is a cyclic number.

It is not a de Polignac number, because 172466599903721 - 2¹⁸ = 172466599641577 is a prime.

It is not a weakly prime, because it can be changed into another prime (172466599903729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 86233299951860 + 86233299951861.

It is an arithmetic number, because the mean of its divisors is an integer number (86233299951861).

Almost surely, 2^{172466599903721} is an apocalyptic number.

It is an amenable number.

172466599903721 is a deficient number, since it is larger than the sum of its proper divisors (1).

172466599903721 is an equidigital number, since it uses as much as digits as its factorization.

172466599903721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 308629440, while the sum is 71.

The spelling of 172466599903721 in words is "one hundred seventy-two trillion, four hundred sixty-six billion, five hundred ninety-nine million, nine hundred three thousand, seven hundred twenty-one".