18621630338 has 4 divisors (see below), whose sum is σ = 27932445510. Its totient is φ = 9310815168.

The previous prime is 18621630337. The next prime is 18621630341. The reversal of 18621630338 is 83303612681.

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., 17970206809 + 651423529 = 134053^2 + 25523^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18621630295 and 18621630304.

It is not an unprimeable number, because it can be changed into a prime (18621630337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4655407583 + ... + 4655407586.

Almost surely, 2^18621630338 is an apocalyptic number.

18621630338 is a deficient number, since it is larger than the sum of its proper divisors (9310815172).

18621630338 is an equidigital number, since it uses as much as digits as its factorization.

18621630338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9310815171.

The product of its (nonzero) digits is 124416, while the sum is 41.

The spelling of 18621630338 in words is "eighteen billion, six hundred twenty-one million, six hundred thirty thousand, three hundred thirty-eight".