3856465665 has 24 divisors (see below), whose sum is σ = 7198737000. Its totient is φ = 1898567424.

The previous prime is 3856465643. The next prime is 3856465687. The reversal of 3856465665 is 5665646583.

3856465665 is a `hidden beast` number, since 38 + 5 + 6 + 46 + 566 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (3856465643) and next prime (3856465687).

It can be written as a sum of positive squares in 4 ways, for example, as 2663424 + 3853802241 = 1632^2 + 62079^2 .

It is not a de Polignac number, because 3856465665 - 2⁷ = 3856465537 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3295540 + ... + 3296709.

It is an arithmetic number, because the mean of its divisors is an integer number (299947375).

Almost surely, 2^3856465665 is an apocalyptic number.

It is an amenable number.

3856465665 is a deficient number, since it is larger than the sum of its proper divisors (3342271335).

3856465665 is a wasteful number, since it uses less digits than its factorization.

3856465665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6592273 (or 6592270 counting only the distinct ones).

The product of its digits is 15552000, while the sum is 54.

The square root of 3856465665 is about 62100.4481867885. The cubic root of 3856465665 is about 1568.1820906089.

The spelling of 3856465665 in words is "three billion, eight hundred fifty-six million, four hundred sixty-five thousand, six hundred sixty-five".