3645156661 has 8 divisors (see below), whose sum is σ = 3657835800. Its totient is φ = 3632498688.

The previous prime is 3645156629. The next prime is 3645156737. The reversal of 3645156661 is 1666515463.

3645156661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 476592561 + 3168564100 = 21831^2 + 56290^2 .

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 3645156661 - 2⁵ = 3645156629 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 (3645156611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 389145 + ... + 398401.

It is an arithmetic number, because the mean of its divisors is an integer number (457229475).

Almost surely, 2^3645156661 is an apocalyptic number.

It is an amenable number.

3645156661 is a deficient number, since it is larger than the sum of its proper divisors (12679139).

3645156661 is an equidigital number, since it uses as much as digits as its factorization.

3645156661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10583.

The product of its digits is 388800, while the sum is 43.

The square root of 3645156661 is about 60375.1328031666. The cubic root of 3645156661 is about 1539.0003999682. Note that the first 3 decimals are identical.

The spelling of 3645156661 in words is "three billion, six hundred forty-five million, one hundred fifty-six thousand, six hundred sixty-one".