18229588994 has 4 divisors (see below), whose sum is σ = 27344383494. Its totient is φ = 9114794496.

The previous prime is 18229588973. The next prime is 18229588999. The reversal of 18229588994 is 49988592281.

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., 18223650025 + 5938969 = 134995^2 + 2437^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18229588994.

It is not an unprimeable number, because it can be changed into a prime (18229588999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4557397247 + ... + 4557397250.

Almost surely, 2^18229588994 is an apocalyptic number.

18229588994 is a deficient number, since it is larger than the sum of its proper divisors (9114794500).

18229588994 is an equidigital number, since it uses as much as digits as its factorization.

18229588994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9114794499.

The product of its digits is 29859840, while the sum is 65.

The spelling of 18229588994 in words is "eighteen billion, two hundred twenty-nine million, five hundred eighty-eight thousand, nine hundred ninety-four".