77875857877 has 4 divisors (see below), whose sum is σ = 79345213740. Its totient is φ = 76406502016.

The previous prime is 77875857869. The next prime is 77875857883.

It is a happy number.

77875857877 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 64455562161 + 13420295716 = 253881^2 + 115846^2 .

It is a cyclic number.

It is not a de Polignac number, because 77875857877 - 2³ = 77875857869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77875857077) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 734677852 + ... + 734677957.

It is an arithmetic number, because the mean of its divisors is an integer number (19836303435).

Almost surely, 2^77875857877 is an apocalyptic number.

It is an amenable number.

77875857877 is a deficient number, since it is larger than the sum of its proper divisors (1469355863).

77875857877 is a wasteful number, since it uses less digits than its factorization.

77875857877 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1469355862.

The product of its digits is 1505907200, while the sum is 76.

The spelling of 77875857877 in words is "seventy-seven billion, eight hundred seventy-five million, eight hundred fifty-seven thousand, eight hundred seventy-seven".