18149307718898 has 4 divisors (see below), whose sum is σ = 27223961578350. Its totient is φ = 9074653859448.

The previous prime is 18149307718879. The next prime is 18149307718901. The reversal of 18149307718898 is 89881770394181.

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., 14760295499569 + 3389012219329 = 3841913^2 + 1840927^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4537326929723 + ... + 4537326929726.

Almost surely, 2^{18149307718898} is an apocalyptic number.

18149307718898 is a deficient number, since it is larger than the sum of its proper divisors (9074653859452).

18149307718898 is an equidigital number, since it uses as much as digits as its factorization.

18149307718898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9074653859451.

The product of its (nonzero) digits is 195084288, while the sum is 74.

The spelling of 18149307718898 in words is "eighteen trillion, one hundred forty-nine billion, three hundred seven million, seven hundred eighteen thousand, eight hundred ninety-eight".