16401165401 has 2 divisors, whose sum is σ = 16401165402. Its totient is φ = 16401165400.

The previous prime is 16401165337. The next prime is 16401165437. The reversal of 16401165401 is 10456110461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9949863001 + 6451302400 = 99749^2 + 80320^2 .

It is a cyclic number.

It is not a de Polignac number, because 16401165401 - 2⁶ = 16401165337 is a prime.

It is not a weakly prime, because it can be changed into another prime (16401165601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8200582700 + 8200582701.

It is an arithmetic number, because the mean of its divisors is an integer number (8200582701).

Almost surely, 2^16401165401 is an apocalyptic number.

It is an amenable number.

16401165401 is a deficient number, since it is larger than the sum of its proper divisors (1).

16401165401 is an equidigital number, since it uses as much as digits as its factorization.

16401165401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 16401165401 its reverse (10456110461), we get a palindrome (26857275862).

The spelling of 16401165401 in words is "sixteen billion, four hundred one million, one hundred sixty-five thousand, four hundred one".