12779013915 has 12 divisors (see below), whose sum is σ = 22150290864. Its totient is φ = 6815474064.

The previous prime is 12779013899. The next prime is 12779013931. The reversal of 12779013915 is 51931097721.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (12779013899) and next prime (12779013931).

It is not a de Polignac number, because 12779013915 - 2⁴ = 12779013899 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 283978087 = 12779013915 / (1 + 2 + 7 + 7 + 9 + 0 + 1 + 3 + 9 + 1 + 5).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141988999 + ... + 141989088.

It is an arithmetic number, because the mean of its divisors is an integer number (1845857572).

Almost surely, 2^12779013915 is an apocalyptic number.

12779013915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12779013915 is a deficient number, since it is larger than the sum of its proper divisors (9371276949).

12779013915 is a wasteful number, since it uses less digits than its factorization.

12779013915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283978098 (or 283978095 counting only the distinct ones).

The product of its (nonzero) digits is 119070, while the sum is 45.

The spelling of 12779013915 in words is "twelve billion, seven hundred seventy-nine million, thirteen thousand, nine hundred fifteen".