18621667748 has 12 divisors (see below), whose sum is σ = 32910571932. Its totient is φ = 9218647200.

The previous prime is 18621667739. The next prime is 18621667751. The reversal of 18621667748 is 84776612681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10094622784 + 8527044964 = 100472^2 + 92342^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18621667693 and 18621667702.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23046215 + ... + 23047022.

It is an arithmetic number, because the mean of its divisors is an integer number (2742547661).

Almost surely, 2^18621667748 is an apocalyptic number.

It is an amenable number.

18621667748 is a deficient number, since it is larger than the sum of its proper divisors (14288904184).

18621667748 is a wasteful number, since it uses less digits than its factorization.

18621667748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46093342 (or 46093340 counting only the distinct ones).

The product of its digits is 5419008, while the sum is 56.

The spelling of 18621667748 in words is "eighteen billion, six hundred twenty-one million, six hundred sixty-seven thousand, seven hundred forty-eight".