77887065987729 has 6 divisors (see below), whose sum is σ = 112503539760066. Its totient is φ = 51924710658480.

The previous prime is 77887065987721. The next prime is 77887065987749. The reversal of 77887065987729 is 92778956078877.

77887065987729 is a `hidden beast` number, since 7 + 7 + 8 + 8 + 7 + 0 + 6 + 598 + 7 + 7 + 2 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 63898919942400 + 13988146045329 = 7993680^2 + 3740073^2 .

It is not a de Polignac number, because 77887065987729 - 2³ = 77887065987721 is a prime.

It is not an unprimeable number, because it can be changed into a prime (77887065987721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4327059221532 + ... + 4327059221549.

It is an arithmetic number, because the mean of its divisors is an integer number (18750589960011).

Almost surely, 2^{77887065987729} is an apocalyptic number.

It is an amenable number.

77887065987729 is a deficient number, since it is larger than the sum of its proper divisors (34616473772337).

77887065987729 is a wasteful number, since it uses less digits than its factorization.

77887065987729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8654118443087 (or 8654118443084 counting only the distinct ones).

The product of its (nonzero) digits is 41821194240, while the sum is 90.

The spelling of 77887065987729 in words is "seventy-seven trillion, eight hundred eighty-seven billion, sixty-five million, nine hundred eighty-seven thousand, seven hundred twenty-nine".