8172449520401 has 2 divisors, whose sum is σ = 8172449520402. Its totient is φ = 8172449520400.

The previous prime is 8172449520343. The next prime is 8172449520419. The reversal of 8172449520401 is 1040259442718.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4786293817600 + 3386155702801 = 2187760^2 + 1840151^2 .

It is a cyclic number.

It is not a de Polignac number, because 8172449520401 - 2³⁸ = 7897571613457 is a prime.

It is not a weakly prime, because it can be changed into another prime (8172449528401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4086224760200 + 4086224760201.

It is an arithmetic number, because the mean of its divisors is an integer number (4086224760201).

Almost surely, 2^{8172449520401} is an apocalyptic number.

It is an amenable number.

8172449520401 is a deficient number, since it is larger than the sum of its proper divisors (1).

8172449520401 is an equidigital number, since it uses as much as digits as its factorization.

8172449520401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 47.

The spelling of 8172449520401 in words is "eight trillion, one hundred seventy-two billion, four hundred forty-nine million, five hundred twenty thousand, four hundred one".