2664661199641 has 27 divisors (see below), whose sum is σ = 3240657020181. Its totient is φ = 2184475695864.

The previous prime is 2664661199639. The next prime is 2664661199647. The reversal of 2664661199641 is 1469911664662.

The square root of 2664661199641 is 1632379.

It is a perfect power (a square), and thus also a powerful number.

2664661199641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2664661199641 - 2¹ = 2664661199639 is a prime.

It is a super-4 number, since 4×2664661199641⁴ (a number of 51 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2664661199641.

It is not an unprimeable number, because it can be changed into a prime (2664661199647) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 262807950 + ... + 262818088.

Almost surely, 2^{2664661199641} is an apocalyptic number.

2664661199641 is the 1632379-th square number.

2664661199641 is the 816190-th centered octagonal number.

It is an amenable number.

2664661199641 is a deficient number, since it is larger than the sum of its proper divisors (575995820540).

2664661199641 is an frugal number, since it uses more digits than its factorization.

2664661199641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20338 (or 10169 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 61.

The spelling of 2664661199641 in words is "two trillion, six hundred sixty-four billion, six hundred sixty-one million, one hundred ninety-nine thousand, six hundred forty-one".