18403132478 has 4 divisors (see below), whose sum is σ = 27604698720. Its totient is φ = 9201566238.

The previous prime is 18403132471. The next prime is 18403132481. The reversal of 18403132478 is 87423130481.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18403132471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4600783118 + ... + 4600783121.

It is an arithmetic number, because the mean of its divisors is an integer number (6901174680).

Almost surely, 2^18403132478 is an apocalyptic number.

18403132478 is a deficient number, since it is larger than the sum of its proper divisors (9201566242).

18403132478 is an equidigital number, since it uses as much as digits as its factorization.

18403132478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9201566241.

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 18403132478 in words is "eighteen billion, four hundred three million, one hundred thirty-two thousand, four hundred seventy-eight".