181902199122 has 90 divisors (see below), whose sum is σ = 474240968487. Its totient is φ = 51961199976.

The previous prime is 181902199111. The next prime is 181902199133. The reversal of 181902199122 is 221991209181.

It is an interprime number because it is at equal distance from previous prime (181902199111) and next prime (181902199133).

It can be written as a sum of positive squares in only one way, i.e., 90951099561 + 90951099561 = 301581^2 + 301581^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=301581.

It is an unprimeable number.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 37996813 + ... + 38001599.

Almost surely, 2^181902199122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 181902199122

181902199122 is an abundant number, since it is smaller than the sum of its proper divisors (292338769365).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181902199122 is an frugal number, since it uses more digits than its factorization.

181902199122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9602 (or 4799 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 45.

The spelling of 181902199122 in words is "one hundred eighty-one billion, nine hundred two million, one hundred ninety-nine thousand, one hundred twenty-two".