16185506401 has 4 divisors (see below), whose sum is σ = 16187501232. Its totient is φ = 16183511572.

The previous prime is 16185506399. The next prime is 16185506437. The reversal of 16185506401 is 10460558161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16185506401 - 2¹ = 16185506399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16185506201) 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, 985195 + ... + 1001488.

It is an arithmetic number, because the mean of its divisors is an integer number (4046875308).

Almost surely, 2^16185506401 is an apocalyptic number.

It is an amenable number.

16185506401 is a deficient number, since it is larger than the sum of its proper divisors (1994831).

16185506401 is an equidigital number, since it uses as much as digits as its factorization.

16185506401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1994830.

The product of its (nonzero) digits is 28800, while the sum is 37.

The spelling of 16185506401 in words is "sixteen billion, one hundred eighty-five million, five hundred six thousand, four hundred one".