3806778555857 has 4 divisors (see below), whose sum is σ = 3806799041136. Its totient is φ = 3806758070580.

The previous prime is 3806778555841. The next prime is 3806778555889. The reversal of 3806778555857 is 7585558776083.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3806778555857 - 2⁴ = 3806778555841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3806778555257) 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, 9961319 + ... + 10336412.

It is an arithmetic number, because the mean of its divisors is an integer number (951699760284).

Almost surely, 2^{3806778555857} is an apocalyptic number.

It is an amenable number.

3806778555857 is a deficient number, since it is larger than the sum of its proper divisors (20485279).

3806778555857 is a wasteful number, since it uses less digits than its factorization.

3806778555857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20485278.

The product of its (nonzero) digits is 1975680000, while the sum is 74.

The spelling of 3806778555857 in words is "three trillion, eight hundred six billion, seven hundred seventy-eight million, five hundred fifty-five thousand, eight hundred fifty-seven".