16401165501 has 16 divisors (see below), whose sum is σ = 25344258048. Its totient is φ = 9240092400.

The previous prime is 16401165493. The next prime is 16401165523. The reversal of 16401165501 is 10556110461.

It is not a de Polignac number, because 16401165501 - 2³ = 16401165493 is a prime.

16401165501 is a modest number, since divided by 165501 gives 16401 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16401165401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5498565 + ... + 5501546.

It is an arithmetic number, because the mean of its divisors is an integer number (1584016128).

Almost surely, 2^16401165501 is an apocalyptic number.

It is an amenable number.

16401165501 is a deficient number, since it is larger than the sum of its proper divisors (8943092547).

16401165501 is a wasteful number, since it uses less digits than its factorization.

16401165501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11000192.

The product of its (nonzero) digits is 3600, while the sum is 30.

Adding to 16401165501 its reverse (10556110461), we get a palindrome (26957275962).

The spelling of 16401165501 in words is "sixteen billion, four hundred one million, one hundred sixty-five thousand, five hundred one".