18691037122 has 4 divisors (see below), whose sum is σ = 28036555686. Its totient is φ = 9345518560.

The previous prime is 18691037063. The next prime is 18691037149. The reversal of 18691037122 is 22173019681.

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., 12362993721 + 6328043401 = 111189^2 + 79549^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4672759279 + ... + 4672759282.

Almost surely, 2^18691037122 is an apocalyptic number.

18691037122 is a deficient number, since it is larger than the sum of its proper divisors (9345518564).

18691037122 is an equidigital number, since it uses as much as digits as its factorization.

18691037122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9345518563.

The product of its (nonzero) digits is 36288, while the sum is 40.

The spelling of 18691037122 in words is "eighteen billion, six hundred ninety-one million, thirty-seven thousand, one hundred twenty-two".