3665473921 has 8 divisors (see below), whose sum is σ = 3919518504. Its totient is φ = 3415699200.

The previous prime is 3665473859. The next prime is 3665473967. The reversal of 3665473921 is 1293745663.

3665473921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1932833296 + 1732640625 = 43964^2 + 41625^2 .

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 3665473921 - 2¹³ = 3665465729 is a prime.

It is a super-2 number, since 2×3665473921² = 26871398131062228482, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3665173921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1065690 + ... + 1069123.

It is an arithmetic number, because the mean of its divisors is an integer number (489939813).

Almost surely, 2^3665473921 is an apocalyptic number.

It is an amenable number.

3665473921 is a deficient number, since it is larger than the sum of its proper divisors (254044583).

3665473921 is a wasteful number, since it uses less digits than its factorization.

3665473921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2134931.

The product of its digits is 816480, while the sum is 46.

The square root of 3665473921 is about 60543.1575076821. The cubic root of 3665473921 is about 1541.8544479883.

The spelling of 3665473921 in words is "three billion, six hundred sixty-five million, four hundred seventy-three thousand, nine hundred twenty-one".