18900354161 has 4 divisors (see below), whose sum is σ = 20354227572. Its totient is φ = 17446480752.

The previous prime is 18900354107. The next prime is 18900354191. The reversal of 18900354161 is 16145300981.

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 1749832561 + 17150521600 = 41831^2 + 130960^2 .

It is a cyclic number.

It is not a de Polignac number, because 18900354161 - 2¹⁰ = 18900353137 is a prime.

It is a super-2 number, since 2×18900354161² (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 (18900354191) 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, 726936686 + ... + 726936711.

It is an arithmetic number, because the mean of its divisors is an integer number (5088556893).

Almost surely, 2^18900354161 is an apocalyptic number.

It is an amenable number.

18900354161 is a deficient number, since it is larger than the sum of its proper divisors (1453873411).

18900354161 is a wasteful number, since it uses less digits than its factorization.

18900354161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1453873410.

The product of its (nonzero) digits is 25920, while the sum is 38.

The spelling of 18900354161 in words is "eighteen billion, nine hundred million, three hundred fifty-four thousand, one hundred sixty-one".