181894209922 has 4 divisors (see below), whose sum is σ = 272841314886. Its totient is φ = 90947104960.

The previous prime is 181894209883. The next prime is 181894209941. The reversal of 181894209922 is 229902498181.

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

It can be written as a sum of positive squares in only one way, i.e., 180539160201 + 1355049721 = 424899^2 + 36811^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45473552479 + ... + 45473552482.

Almost surely, 2^181894209922 is an apocalyptic number.

181894209922 is a deficient number, since it is larger than the sum of its proper divisors (90947104964).

181894209922 is an equidigital number, since it uses as much as digits as its factorization.

181894209922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90947104963.

The product of its (nonzero) digits is 1492992, while the sum is 55.

The spelling of 181894209922 in words is "one hundred eighty-one billion, eight hundred ninety-four million, two hundred nine thousand, nine hundred twenty-two".