3865696856607 has 4 divisors (see below), whose sum is σ = 5154262475480. Its totient is φ = 2577131237736.

The previous prime is 3865696856591. The next prime is 3865696856611. The reversal of 3865696856607 is 7066586965683.

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

It is not a de Polignac number, because 3865696856607 - 2⁴ = 3865696856591 is a prime.

It is a super-2 number, since 2×3865696856607² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3865696856627) 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, 644282809432 + ... + 644282809437.

It is an arithmetic number, because the mean of its divisors is an integer number (1288565618870).

Almost surely, 2^{3865696856607} is an apocalyptic number.

3865696856607 is a deficient number, since it is larger than the sum of its proper divisors (1288565618873).

3865696856607 is a wasteful number, since it uses less digits than its factorization.

3865696856607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1288565618872.

The product of its (nonzero) digits is 2351462400, while the sum is 75.

The spelling of 3865696856607 in words is "three trillion, eight hundred sixty-five billion, six hundred ninety-six million, eight hundred fifty-six thousand, six hundred seven".