3986015665 has 8 divisors (see below), whose sum is σ = 4832530920. Its totient is φ = 3155937792.

The previous prime is 3986015641. The next prime is 3986015689. The reversal of 3986015665 is 5665106893.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (3986015641) and next prime (3986015689).

It can be written as a sum of positive squares in 4 ways, for example, as 415833664 + 3570182001 = 20392^2 + 59751^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3986015665 - 2²¹ = 3983918513 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4108810 + ... + 4109779.

It is an arithmetic number, because the mean of its divisors is an integer number (604066365).

Almost surely, 2^3986015665 is an apocalyptic number.

It is an amenable number.

3986015665 is a deficient number, since it is larger than the sum of its proper divisors (846515255).

3986015665 is an equidigital number, since it uses as much as digits as its factorization.

3986015665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8218691.

The product of its (nonzero) digits is 1166400, while the sum is 49.

The square root of 3986015665 is about 63134.9005305307. The cubic root of 3986015665 is about 1585.5489963004.

The spelling of 3986015665 in words is "three billion, nine hundred eighty-six million, fifteen thousand, six hundred sixty-five".