3856165665 has 32 divisors (see below), whose sum is σ = 6764985216. Its totient is φ = 1860149760.

The previous prime is 3856165657. The next prime is 3856165673. The reversal of 3856165665 is 5665616583.

It is a happy number.

3856165665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3856165657) and next prime (3856165673).

It is not a de Polignac number, because 3856165665 - 2³ = 3856165657 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26812 + ... + 91821.

It is an arithmetic number, because the mean of its divisors is an integer number (211405788).

Almost surely, 2^3856165665 is an apocalyptic number.

It is an amenable number.

3856165665 is a deficient number, since it is larger than the sum of its proper divisors (2908819551).

3856165665 is a wasteful number, since it uses less digits than its factorization.

3856165665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118849.

The product of its digits is 3888000, while the sum is 51.

The square root of 3856165665 is about 62098.0326983070. The cubic root of 3856165665 is about 1568.1414258424.

The spelling of 3856165665 in words is "three billion, eight hundred fifty-six million, one hundred sixty-five thousand, six hundred sixty-five".