18961444322 has 6 divisors (see below), whose sum is σ = 28442458593. Its totient is φ = 9480624792.

The previous prime is 18961444321. The next prime is 18961444331. The reversal of 18961444322 is 22344416981.

It can be written as a sum of positive squares in 2 ways, for example, as 10087992721 + 8873451601 = 100439^2 + 94199^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=97369.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18961444321) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 146054 + ... + 243422.

Almost surely, 2^18961444322 is an apocalyptic number.

18961444322 is a deficient number, since it is larger than the sum of its proper divisors (9481014271).

18961444322 is an frugal number, since it uses more digits than its factorization.

18961444322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194740 (or 97371 counting only the distinct ones).

The product of its digits is 331776, while the sum is 44.

The spelling of 18961444322 in words is "eighteen billion, nine hundred sixty-one million, four hundred forty-four thousand, three hundred twenty-two".