18403478765 has 16 divisors (see below), whose sum is σ = 25241260800. Its totient is φ = 12618426240.

The previous prime is 18403478713. The next prime is 18403478783. The reversal of 18403478765 is 56787430481.

It is a happy number.

It is not a de Polignac number, because 18403478765 - 2⁶ = 18403478701 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 750905 + ... + 775025.

It is an arithmetic number, because the mean of its divisors is an integer number (1577578800).

Almost surely, 2^18403478765 is an apocalyptic number.

It is an amenable number.

18403478765 is a deficient number, since it is larger than the sum of its proper divisors (6837782035).

18403478765 is a wasteful number, since it uses less digits than its factorization.

18403478765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45932.

The product of its (nonzero) digits is 4515840, while the sum is 53.

The spelling of 18403478765 in words is "eighteen billion, four hundred three million, four hundred seventy-eight thousand, seven hundred sixty-five".