77786381665325 has 12 divisors (see below), whose sum is σ = 102128943457620. Its totient is φ = 58568569724160.

The previous prime is 77786381665303. The next prime is 77786381665337. The reversal of 77786381665325 is 52356618368777.

It can be written as a sum of positive squares in 6 ways, for example, as 1685411518756 + 76100970146569 = 1298234^2 + 8723587^2 .

It is not a de Polignac number, because 77786381665325 - 2²⁴ = 77786364888109 is a prime.

It is a congruent number.

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, 91513389770 + ... + 91513390619.

It is an arithmetic number, because the mean of its divisors is an integer number (8510745288135).

Almost surely, 2^{77786381665325} is an apocalyptic number.

It is an amenable number.

77786381665325 is a deficient number, since it is larger than the sum of its proper divisors (24342561792295).

77786381665325 is a wasteful number, since it uses less digits than its factorization.

77786381665325 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 183026780416 (or 183026780411 counting only the distinct ones).

The product of its digits is 2133734400, while the sum is 74.

The spelling of 77786381665325 in words is "seventy-seven trillion, seven hundred eighty-six billion, three hundred eighty-one million, six hundred sixty-five thousand, three hundred twenty-five".