18372773648 has 10 divisors (see below), whose sum is σ = 35597248974. Its totient is φ = 9186386816.

The previous prime is 18372773623. The next prime is 18372773659. The reversal of 18372773648 is 84637727381.

It can be written as a sum of positive squares in only one way, i.e., 14063113744 + 4309659904 = 118588^2 + 65648^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18372773593 and 18372773602.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 574149161 + ... + 574149192.

Almost surely, 2^18372773648 is an apocalyptic number.

It is an amenable number.

18372773648 is a deficient number, since it is larger than the sum of its proper divisors (17224475326).

18372773648 is a wasteful number, since it uses less digits than its factorization.

18372773648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148298361 (or 1148298355 counting only the distinct ones).

The product of its digits is 9483264, while the sum is 56.

The spelling of 18372773648 in words is "eighteen billion, three hundred seventy-two million, seven hundred seventy-three thousand, six hundred forty-eight".