18981439415 has 8 divisors (see below), whose sum is σ = 23066053440. Its totient is φ = 14992934112.

The previous prime is 18981439391. The next prime is 18981439453. The reversal of 18981439415 is 51493418981.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18981439415 - 2²⁰ = 18980390839 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24026744 + ... + 24027533.

It is an arithmetic number, because the mean of its divisors is an integer number (2883256680).

Almost surely, 2^18981439415 is an apocalyptic number.

18981439415 is a deficient number, since it is larger than the sum of its proper divisors (4084614025).

18981439415 is an equidigital number, since it uses as much as digits as its factorization.

18981439415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48054361.

The product of its digits is 1244160, while the sum is 53.

The spelling of 18981439415 in words is "eighteen billion, nine hundred eighty-one million, four hundred thirty-nine thousand, four hundred fifteen".