12515479278 has 16 divisors (see below), whose sum is σ = 25838409216. Its totient is φ = 4037251320.

The previous prime is 12515479259. The next prime is 12515479321. The reversal of 12515479278 is 87297451521.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 12515479278.

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, 33643576 + ... + 33643947.

It is an arithmetic number, because the mean of its divisors is an integer number (1614900576).

Almost surely, 2^12515479278 is an apocalyptic number.

12515479278 is an abundant number, since it is smaller than the sum of its proper divisors (13322929938).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12515479278 is a wasteful number, since it uses less digits than its factorization.

12515479278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67287559.

The product of its digits is 1411200, while the sum is 51.

The spelling of 12515479278 in words is "twelve billion, five hundred fifteen million, four hundred seventy-nine thousand, two hundred seventy-eight".