16405172401 has 2 divisors, whose sum is σ = 16405172402. Its totient is φ = 16405172400.

The previous prime is 16405172383. The next prime is 16405172447. The reversal of 16405172401 is 10427150461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12133242801 + 4271929600 = 110151^2 + 65360^2 .

It is a cyclic number.

It is not a de Polignac number, because 16405172401 - 2³³ = 7815237809 is a prime.

It is not a weakly prime, because it can be changed into another prime (16405172491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8202586200 + 8202586201.

It is an arithmetic number, because the mean of its divisors is an integer number (8202586201).

Almost surely, 2^16405172401 is an apocalyptic number.

It is an amenable number.

16405172401 is a deficient number, since it is larger than the sum of its proper divisors (1).

16405172401 is an equidigital number, since it uses as much as digits as its factorization.

16405172401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The spelling of 16405172401 in words is "sixteen billion, four hundred five million, one hundred seventy-two thousand, four hundred one".