18378810465 has 32 divisors (see below), whose sum is σ = 30486136320. Its totient is φ = 9443486976.

The previous prime is 18378810451. The next prime is 18378810469. The reversal of 18378810465 is 56401887381.

It is a happy number.

It is not a de Polignac number, because 18378810465 - 2⁷ = 18378810337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18378810469) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 155779 + ... + 247031.

It is an arithmetic number, because the mean of its divisors is an integer number (952691760).

Almost surely, 2^18378810465 is an apocalyptic number.

18378810465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18378810465 is a deficient number, since it is larger than the sum of its proper divisors (12107325855).

18378810465 is a wasteful number, since it uses less digits than its factorization.

18378810465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91753.

The product of its (nonzero) digits is 1290240, while the sum is 51.

The spelling of 18378810465 in words is "eighteen billion, three hundred seventy-eight million, eight hundred ten thousand, four hundred sixty-five".