3665621413 has 8 divisors (see below), whose sum is σ = 3986145432. Its totient is φ = 3356752896.

The previous prime is 3665621411. The next prime is 3665621429. The reversal of 3665621413 is 3141265663.

It can be written as a sum of positive squares in 4 ways, for example, as 1516557249 + 2149064164 = 38943^2 + 46358^2 .

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 3665621413 - 2¹ = 3665621411 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665621411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2913220 + ... + 2914477.

It is an arithmetic number, because the mean of its divisors is an integer number (498268179).

Almost surely, 2^3665621413 is an apocalyptic number.

It is an amenable number.

3665621413 is a deficient number, since it is larger than the sum of its proper divisors (320524019).

3665621413 is a wasteful number, since it uses less digits than its factorization.

3665621413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5827751.

The product of its digits is 77760, while the sum is 37.

The square root of 3665621413 is about 60544.3755686686. The cubic root of 3665621413 is about 1541.8751281833.

The spelling of 3665621413 in words is "three billion, six hundred sixty-five million, six hundred twenty-one thousand, four hundred thirteen".