16004505401 has 4 divisors (see below), whose sum is σ = 16266874404. Its totient is φ = 15742136400.

The previous prime is 16004505371. The next prime is 16004505481. The reversal of 16004505401 is 10450540061.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6634265401 + 9370240000 = 81451^2 + 96800^2 .

It is a cyclic number.

It is not a de Polignac number, because 16004505401 - 2²⁶ = 15937396537 is a prime.

It is a super-2 number, since 2×16004505401² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16004505481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131184410 + ... + 131184531.

It is an arithmetic number, because the mean of its divisors is an integer number (4066718601).

Almost surely, 2^16004505401 is an apocalyptic number.

It is an amenable number.

16004505401 is a deficient number, since it is larger than the sum of its proper divisors (262369003).

16004505401 is an equidigital number, since it uses as much as digits as its factorization.

16004505401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262369002.

The product of its (nonzero) digits is 2400, while the sum is 26.

The spelling of 16004505401 in words is "sixteen billion, four million, five hundred five thousand, four hundred one".