3915391664 has 20 divisors (see below), whose sum is σ = 7590020160. Its totient is φ = 1956676800.

The previous prime is 3915391661. The next prime is 3915391673. The reversal of 3915391664 is 4661935193.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (3915391661) 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, 31499 + ... + 93930.

It is an arithmetic number, because the mean of its divisors is an integer number (379501008).

Almost surely, 2^3915391664 is an apocalyptic number.

It is an amenable number.

3915391664 is a deficient number, since it is larger than the sum of its proper divisors (3674628496).

3915391664 is a wasteful number, since it uses less digits than its factorization.

3915391664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127388 (or 127382 counting only the distinct ones).

The product of its digits is 524880, while the sum is 47.

The square root of 3915391664 is about 62573.0905741438. The cubic root of 3915391664 is about 1576.1289178814.

The spelling of 3915391664 in words is "three billion, nine hundred fifteen million, three hundred ninety-one thousand, six hundred sixty-four".