3921049665 has 48 divisors (see below), whose sum is σ = 7704540480. Its totient is φ = 1828759680.

The previous prime is 3921049651. The next prime is 3921049667. The reversal of 3921049665 is 5669401293.

3921049665 is a `hidden beast` number, since 3 + 92 + 10 + 496 + 65 = 666.

3921049665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3921049665 - 2⁷ = 3921049537 is a prime.

It is a super-2 number, since 2×3921049665² = 30749260950793224450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 3921049665.

It is not an unprimeable number, because it can be changed into a prime (3921049667) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 165271 + ... + 187500.

It is an arithmetic number, because the mean of its divisors is an integer number (160511260).

Almost surely, 2^3921049665 is an apocalyptic number.

It is an amenable number.

3921049665 is a deficient number, since it is larger than the sum of its proper divisors (3783490815).

3921049665 is a wasteful number, since it uses less digits than its factorization.

3921049665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352814 (or 352811 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 3921049665 is about 62618.2853885349. The cubic root of 3921049665 is about 1576.8877561304.

The spelling of 3921049665 in words is "three billion, nine hundred twenty-one million, forty-nine thousand, six hundred sixty-five".