18621013999 has 16 divisors (see below), whose sum is σ = 22040709120. Its totient is φ = 15392492640.

The previous prime is 18621013997. The next prime is 18621014003. The reversal of 18621013999 is 99931012681.

It is not a de Polignac number, because 18621013999 - 2¹ = 18621013997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18621013997) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122044 + ... + 228334.

It is an arithmetic number, because the mean of its divisors is an integer number (1377544320).

Almost surely, 2^18621013999 is an apocalyptic number.

18621013999 is a deficient number, since it is larger than the sum of its proper divisors (3419695121).

18621013999 is a wasteful number, since it uses less digits than its factorization.

18621013999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107190.

The product of its (nonzero) digits is 209952, while the sum is 49.

The spelling of 18621013999 in words is "eighteen billion, six hundred twenty-one million, thirteen thousand, nine hundred ninety-nine".