13815542878 has 4 divisors (see below), whose sum is σ = 20723314320. Its totient is φ = 6907771438.

The previous prime is 13815542857. The next prime is 13815542893. The reversal of 13815542878 is 87824551831.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3453885718 + ... + 3453885721.

It is an arithmetic number, because the mean of its divisors is an integer number (5180828580).

Almost surely, 2^13815542878 is an apocalyptic number.

13815542878 is a deficient number, since it is larger than the sum of its proper divisors (6907771442).

13815542878 is an equidigital number, since it uses as much as digits as its factorization.

13815542878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6907771441.

The product of its digits is 2150400, while the sum is 52.

The spelling of 13815542878 in words is "thirteen billion, eight hundred fifteen million, five hundred forty-two thousand, eight hundred seventy-eight".