57778786669 has 4 divisors (see below), whose sum is σ = 61177538844. Its totient is φ = 54380034496.

The previous prime is 57778786661. The next prime is 57778786679. The reversal of 57778786669 is 96668787775.

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 38807030025 + 18971756644 = 196995^2 + 137738^2 .

It is a cyclic number.

It is not a de Polignac number, because 57778786669 - 2³ = 57778786661 is a prime.

It is a super-2 number, since 2×57778786669² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 57778786595 and 57778786604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57778786661) 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, 1699376062 + ... + 1699376095.

It is an arithmetic number, because the mean of its divisors is an integer number (15294384711).

Almost surely, 2^57778786669 is an apocalyptic number.

It is an amenable number.

57778786669 is a deficient number, since it is larger than the sum of its proper divisors (3398752175).

57778786669 is a wasteful number, since it uses less digits than its factorization.

57778786669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3398752174.

The product of its digits is 1493614080, while the sum is 76.

The spelling of 57778786669 in words is "fifty-seven billion, seven hundred seventy-eight million, seven hundred eighty-six thousand, six hundred sixty-nine".