77658807816 has 48 divisors (see below), whose sum is σ = 211665624300. Its totient is φ = 25721384832.

The previous prime is 77658807803. The next prime is 77658807829. The reversal of 77658807816 is 61870885677.

It is an interprime number because it is at equal distance from previous prime (77658807803) and next prime (77658807829).

It can be written as a sum of positive squares in 2 ways, for example, as 77423062500 + 235745316 = 278250^2 + 15354^2 .

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, 3423711 + ... + 3446318.

Almost surely, 2^77658807816 is an apocalyptic number.

It is an amenable number.

77658807816 is an abundant number, since it is smaller than the sum of its proper divisors (134006816484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77658807816 is a wasteful number, since it uses less digits than its factorization.

77658807816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6870198 (or 6870191 counting only the distinct ones).

The product of its (nonzero) digits is 31610880, while the sum is 63.

The spelling of 77658807816 in words is "seventy-seven billion, six hundred fifty-eight million, eight hundred seven thousand, eight hundred sixteen".