16161844549 has 8 divisors (see below), whose sum is σ = 16330144320. Its totient is φ = 15993988416.

The previous prime is 16161844499. The next prime is 16161844627. The reversal of 16161844549 is 94544816161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16161844549 - 2²⁵ = 16128290117 is a prime.

It is a super-2 number, since 2×16161844549² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16161844649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37419 + ... + 183640.

It is an arithmetic number, because the mean of its divisors is an integer number (2041268040).

Almost surely, 2^16161844549 is an apocalyptic number.

It is an amenable number.

16161844549 is a deficient number, since it is larger than the sum of its proper divisors (168299771).

16161844549 is a wasteful number, since it uses less digits than its factorization.

16161844549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221819.

The product of its digits is 829440, while the sum is 49.

The spelling of 16161844549 in words is "sixteen billion, one hundred sixty-one million, eight hundred forty-four thousand, five hundred forty-nine".