3665621407 has 4 divisors (see below), whose sum is σ = 4189281616. Its totient is φ = 3141961200.

The previous prime is 3665621369. The next prime is 3665621411. The reversal of 3665621407 is 7041265663.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 3665621407 - 2¹¹ = 3665619359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3665621407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665621497) 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, 261830094 + ... + 261830107.

It is an arithmetic number, because the mean of its divisors is an integer number (1047320404).

Almost surely, 2^3665621407 is an apocalyptic number.

3665621407 is a deficient number, since it is larger than the sum of its proper divisors (523660209).

3665621407 is an equidigital number, since it uses as much as digits as its factorization.

3665621407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 523660208.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 3665621407 is about 60544.3755191182. The cubic root of 3665621407 is about 1541.8751273420.

The spelling of 3665621407 in words is "three billion, six hundred sixty-five million, six hundred twenty-one thousand, four hundred seven".