16172901619 has 4 divisors (see below), whose sum is σ = 18483316144. Its totient is φ = 13862487096.

The previous prime is 16172901617. The next prime is 16172901673. The reversal of 16172901619 is 91610927161.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 16172901619 - 2¹ = 16172901617 is a prime.

It is a super-2 number, since 2×16172901619² (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 (16172901617) 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, 1155207252 + ... + 1155207265.

It is an arithmetic number, because the mean of its divisors is an integer number (4620829036).

Almost surely, 2^16172901619 is an apocalyptic number.

16172901619 is a deficient number, since it is larger than the sum of its proper divisors (2310414525).

16172901619 is an equidigital number, since it uses as much as digits as its factorization.

16172901619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310414524.

The product of its (nonzero) digits is 40824, while the sum is 43.

The spelling of 16172901619 in words is "sixteen billion, one hundred seventy-two million, nine hundred one thousand, six hundred nineteen".