13851979898 has 4 divisors (see below), whose sum is σ = 20777969850. Its totient is φ = 6925989948.

The previous prime is 13851979837. The next prime is 13851979903. The reversal of 13851979898 is 89897915831.

13851979898 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89897915831 = 1879 ⋅47843489.

It can be written as a sum of positive squares in only one way, i.e., 9509565289 + 4342414609 = 97517^2 + 65897^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3462994973 + ... + 3462994976.

Almost surely, 2^13851979898 is an apocalyptic number.

13851979898 is a deficient number, since it is larger than the sum of its proper divisors (6925989952).

13851979898 is an equidigital number, since it uses as much as digits as its factorization.

13851979898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6925989951.

The product of its digits is 39191040, while the sum is 68.

The spelling of 13851979898 in words is "thirteen billion, eight hundred fifty-one million, nine hundred seventy-nine thousand, eight hundred ninety-eight".