65876778657 has 16 divisors (see below), whose sum is σ = 97600956480. Its totient is φ = 43915274496.

The previous prime is 65876778629. The next prime is 65876778677. The reversal of 65876778657 is 75687767856.

It is not a de Polignac number, because 65876778657 - 2¹⁹ = 65876254369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (65876778677) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 471873 + ... + 595329.

It is an arithmetic number, because the mean of its divisors is an integer number (6100059780).

Almost surely, 2^65876778657 is an apocalyptic number.

It is an amenable number.

65876778657 is a deficient number, since it is larger than the sum of its proper divisors (31724177823).

65876778657 is a wasteful number, since it uses less digits than its factorization.

65876778657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143229 (or 143223 counting only the distinct ones).

The product of its digits is 829785600, while the sum is 72.

The spelling of 65876778657 in words is "sixty-five billion, eight hundred seventy-six million, seven hundred seventy-eight thousand, six hundred fifty-seven".