18436949880019 has 16 divisors (see below), whose sum is σ = 20134111113216. Its totient is φ = 16743305088000.

The previous prime is 18436949879989. The next prime is 18436949880043. The reversal of 18436949880019 is 91008894963481.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18436949880019 is a prime.

It is a super-2 number, since 2×18436949880019² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18436949880019.

It is not an unprimeable number, because it can be changed into a prime (18436949880619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97558419 + ... + 97747219.

It is an arithmetic number, because the mean of its divisors is an integer number (1258381944576).

Almost surely, 2^{18436949880019} is an apocalyptic number.

18436949880019 is a deficient number, since it is larger than the sum of its proper divisors (1697161233197).

18436949880019 is a wasteful number, since it uses less digits than its factorization.

18436949880019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198066.

The product of its (nonzero) digits is 107495424, while the sum is 70.

The spelling of 18436949880019 in words is "eighteen trillion, four hundred thirty-six billion, nine hundred forty-nine million, eight hundred eighty thousand, nineteen".