3915391665 has 16 divisors (see below), whose sum is σ = 6296112000. Its totient is φ = 2077713792.

The previous prime is 3915391661. The next prime is 3915391673. The reversal of 3915391665 is 5661935193.

It is not a de Polignac number, because 3915391665 - 2² = 3915391661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3915391661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 652860 + ... + 658829.

It is an arithmetic number, because the mean of its divisors is an integer number (393507000).

Almost surely, 2^3915391665 is an apocalyptic number.

It is an amenable number.

3915391665 is a deficient number, since it is larger than the sum of its proper divisors (2380720335).

3915391665 is a wasteful number, since it uses less digits than its factorization.

3915391665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1311896.

The product of its digits is 656100, while the sum is 48.

The square root of 3915391665 is about 62573.0905821344. The cubic root of 3915391665 is about 1576.1289180156.

The spelling of 3915391665 in words is "three billion, nine hundred fifteen million, three hundred ninety-one thousand, six hundred sixty-five".