3665575421 has 4 divisors (see below), whose sum is σ = 3665837472. Its totient is φ = 3665313372.

The previous prime is 3665575393. The next prime is 3665575429. The reversal of 3665575421 is 1245755663.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 3665575421 - 2¹⁰ = 3665574397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665575429) 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, 108785 + ... + 138438.

It is an arithmetic number, because the mean of its divisors is an integer number (916459368).

Almost surely, 2^3665575421 is an apocalyptic number.

It is an amenable number.

3665575421 is a deficient number, since it is larger than the sum of its proper divisors (262051).

3665575421 is a wasteful number, since it uses less digits than its factorization.

3665575421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262050.

The product of its digits is 756000, while the sum is 44.

The square root of 3665575421 is about 60543.9957468947. The cubic root of 3665575421 is about 1541.8686795980.

The spelling of 3665575421 in words is "three billion, six hundred sixty-five million, five hundred seventy-five thousand, four hundred twenty-one".