313887777779 has 4 divisors (see below), whose sum is σ = 320566241184. Its totient is φ = 307209314376.

The previous prime is 313887777743. The next prime is 313887777787. The reversal of 313887777779 is 977777788313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 977777788313 = 17 ⋅57516340489.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-313887777779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (313887777979) 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, 3339231632 + ... + 3339231725.

It is an arithmetic number, because the mean of its divisors is an integer number (80141560296).

Almost surely, 2^313887777779 is an apocalyptic number.

313887777779 is a deficient number, since it is larger than the sum of its proper divisors (6678463405).

313887777779 is an equidigital number, since it uses as much as digits as its factorization.

313887777779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6678463404.

The product of its digits is 609892416, while the sum is 74.

The spelling of 313887777779 in words is "three hundred thirteen billion, eight hundred eighty-seven million, seven hundred seventy-seven thousand, seven hundred seventy-nine".