76778776315 has 4 divisors (see below), whose sum is σ = 92134531584. Its totient is φ = 61423021048.

The previous prime is 76778776309. The next prime is 76778776337. The reversal of 76778776315 is 51367787767.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 76778776315 - 2³¹ = 74631292667 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7677877627 + ... + 7677877636.

It is an arithmetic number, because the mean of its divisors is an integer number (23033632896).

Almost surely, 2^76778776315 is an apocalyptic number.

76778776315 is a deficient number, since it is larger than the sum of its proper divisors (15355755269).

76778776315 is a wasteful number, since it uses less digits than its factorization.

76778776315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15355755268.

The product of its digits is 72606240, while the sum is 64.

The spelling of 76778776315 in words is "seventy-six billion, seven hundred seventy-eight million, seven hundred seventy-six thousand, three hundred fifteen".