3665621429 has 2 divisors, whose sum is σ = 3665621430. Its totient is φ = 3665621428.

The previous prime is 3665621411. The next prime is 3665621459. The reversal of 3665621429 is 9241265663.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1976247025 + 1689374404 = 44455^2 + 41102^2 .

It is a cyclic number.

It is not a de Polignac number, because 3665621429 - 2¹⁶ = 3665555893 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3665621429.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3665621459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1832810714 + 1832810715.

It is an arithmetic number, because the mean of its divisors is an integer number (1832810715).

Almost surely, 2^3665621429 is an apocalyptic number.

It is an amenable number.

3665621429 is a deficient number, since it is larger than the sum of its proper divisors (1).

3665621429 is an equidigital number, since it uses as much as digits as its factorization.

3665621429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 44.

The square root of 3665621429 is about 60544.3757008031. The cubic root of 3665621429 is about 1541.8751304267.

It can be divided in two parts, 36656 and 21429, that added together give a palindrome (58085).

The spelling of 3665621429 in words is "three billion, six hundred sixty-five million, six hundred twenty-one thousand, four hundred twenty-nine".