77612082691985 has 16 divisors (see below), whose sum is σ = 93816299618064. Its totient is φ = 61636231802112.

The previous prime is 77612082691939. The next prime is 77612082692009. The reversal of 77612082691985 is 58919628021677.

It is a Cunningham number, because it is equal to 8809772²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 8543999152144 + 69068083539841 = 2923012^2 + 8310721^2 .

It is not a de Polignac number, because 77612082691985 - 2⁶ = 77612082691921 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68137262 + ... + 69266951.

It is an arithmetic number, because the mean of its divisors is an integer number (5863518726129).

Almost surely, 2^{77612082691985} is an apocalyptic number.

It is an amenable number.

77612082691985 is a deficient number, since it is larger than the sum of its proper divisors (16204216926079).

77612082691985 is a wasteful number, since it uses less digits than its factorization.

77612082691985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137405044.

The product of its (nonzero) digits is 182891520, while the sum is 71.

The spelling of 77612082691985 in words is "seventy-seven trillion, six hundred twelve billion, eighty-two million, six hundred ninety-one thousand, nine hundred eighty-five".