77875857869 has 2 divisors, whose sum is σ = 77875857870. Its totient is φ = 77875857868.

The previous prime is 77875857863. The next prime is 77875857883. The reversal of 77875857869 is 96875857877.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77820355369 + 55502500 = 278963^2 + 7450^2 .

It is a cyclic number.

It is not a de Polignac number, because 77875857869 - 2⁴ = 77875857853 is a prime.

It is a super-2 number, since 2×77875857869² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 77875857869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77875857863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38937928934 + 38937928935.

It is an arithmetic number, because the mean of its divisors is an integer number (38937928935).

Almost surely, 2^77875857869 is an apocalyptic number.

It is an amenable number.

77875857869 is a deficient number, since it is larger than the sum of its proper divisors (1).

77875857869 is an equidigital number, since it uses as much as digits as its factorization.

77875857869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1659571200, while the sum is 77.

The spelling of 77875857869 in words is "seventy-seven billion, eight hundred seventy-five million, eight hundred fifty-seven thousand, eight hundred sixty-nine".