12815812012777 has 4 divisors (see below), whose sum is σ = 12816148892416. Its totient is φ = 12815475133140.

The previous prime is 12815812012769. The next prime is 12815812012849. The reversal of 12815812012777 is 77721021851821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 12815812012777 - 2³ = 12815812012769 is a prime.

It is a super-2 number, since 2×12815812012777² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12815812012877) 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, 168382749 + ... + 168458842.

It is an arithmetic number, because the mean of its divisors is an integer number (3204037223104).

Almost surely, 2^{12815812012777} is an apocalyptic number.

It is an amenable number.

12815812012777 is a deficient number, since it is larger than the sum of its proper divisors (336879639).

12815812012777 is an equidigital number, since it uses as much as digits as its factorization.

12815812012777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336879638.

The product of its (nonzero) digits is 878080, while the sum is 52.

The spelling of 12815812012777 in words is "twelve trillion, eight hundred fifteen billion, eight hundred twelve million, twelve thousand, seven hundred seventy-seven".