12776442551 has 4 divisors (see below), whose sum is σ = 12779569704. Its totient is φ = 12773315400.

The previous prime is 12776442533. The next prime is 12776442563. The reversal of 12776442551 is 15524467721.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15524467721 = 7 ⋅2217781103.

It is a cyclic number.

It is not a de Polignac number, because 12776442551 - 2⁶ = 12776442487 is a prime.

It is a Duffinian number.

It is a zygodrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12776442451) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1557440 + ... + 1565621.

It is an arithmetic number, because the mean of its divisors is an integer number (3194892426).

Almost surely, 2^12776442551 is an apocalyptic number.

12776442551 is a deficient number, since it is larger than the sum of its proper divisors (3127153).

12776442551 is an equidigital number, since it uses as much as digits as its factorization.

12776442551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3127152.

The product of its digits is 470400, while the sum is 44.

The spelling of 12776442551 in words is "twelve billion, seven hundred seventy-six million, four hundred forty-two thousand, five hundred fifty-one".