18624965972 has 6 divisors (see below), whose sum is σ = 32593690458. Its totient is φ = 9312482984.

The previous prime is 18624965959. The next prime is 18624965981. The reversal of 18624965972 is 27956942681.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17938316356 + 686649616 = 133934^2 + 26204^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2328120743 + ... + 2328120750.

It is an arithmetic number, because the mean of its divisors is an integer number (5432281743).

Almost surely, 2^18624965972 is an apocalyptic number.

It is an amenable number.

18624965972 is a deficient number, since it is larger than the sum of its proper divisors (13968724486).

18624965972 is a wasteful number, since it uses less digits than its factorization.

18624965972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4656241497 (or 4656241495 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 59.

The spelling of 18624965972 in words is "eighteen billion, six hundred twenty-four million, nine hundred sixty-five thousand, nine hundred seventy-two".