3643563761 has 4 divisors (see below), whose sum is σ = 3681126372. Its totient is φ = 3606001152.

The previous prime is 3643563731. The next prime is 3643563767. The reversal of 3643563761 is 1673653463.

It is a happy number.

3643563761 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1131649600 + 2511914161 = 33640^2 + 50119^2 .

It is a cyclic number.

It is not a de Polignac number, because 3643563761 - 2⁶ = 3643563697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3643563767) 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, 18781160 + ... + 18781353.

It is an arithmetic number, because the mean of its divisors is an integer number (920281593).

Almost surely, 2^3643563761 is an apocalyptic number.

It is an amenable number.

3643563761 is a deficient number, since it is larger than the sum of its proper divisors (37562611).

3643563761 is an equidigital number, since it uses as much as digits as its factorization.

3643563761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37562610.

The product of its digits is 816480, while the sum is 44.

The square root of 3643563761 is about 60361.9396722802. The cubic root of 3643563761 is about 1538.7761909568.

The spelling of 3643563761 in words is "three billion, six hundred forty-three million, five hundred sixty-three thousand, seven hundred sixty-one".