18724999798 has 16 divisors (see below), whose sum is σ = 29434500576. Its totient is φ = 8916994240.

The previous prime is 18724999793. The next prime is 18724999823. The reversal of 18724999798 is 89799942781.

It is a self number, because there is not a number n which added to its sum of digits gives 18724999798.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18724999793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 862813 + ... + 884248.

It is an arithmetic number, because the mean of its divisors is an integer number (1839656286).

Almost surely, 2^18724999798 is an apocalyptic number.

18724999798 is a deficient number, since it is larger than the sum of its proper divisors (10709500778).

18724999798 is a wasteful number, since it uses less digits than its factorization.

18724999798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747319.

The product of its digits is 164602368, while the sum is 73.

The spelling of 18724999798 in words is "eighteen billion, seven hundred twenty-four million, nine hundred ninety-nine thousand, seven hundred ninety-eight".