18621074722 has 4 divisors (see below), whose sum is σ = 27931612086. Its totient is φ = 9310537360.

The previous prime is 18621074711. The next prime is 18621074743. The reversal of 18621074722 is 22747012681.

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., 11618899681 + 7002175041 = 107791^2 + 83679^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4655268679 + ... + 4655268682.

Almost surely, 2^18621074722 is an apocalyptic number.

18621074722 is a deficient number, since it is larger than the sum of its proper divisors (9310537364).

18621074722 is an equidigital number, since it uses as much as digits as its factorization.

18621074722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9310537363.

The product of its (nonzero) digits is 75264, while the sum is 40.

The spelling of 18621074722 in words is "eighteen billion, six hundred twenty-one million, seventy-four thousand, seven hundred twenty-two".