2647965661 has 16 divisors (see below), whose sum is σ = 2940420096. Its totient is φ = 2364390000.

The previous prime is 2647965659. The next prime is 2647965673. The reversal of 2647965661 is 1665697462.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2647965661 - 2¹ = 2647965659 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2647965599 and 2647965608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2647965641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205396 + ... + 217906.

It is an arithmetic number, because the mean of its divisors is an integer number (183776256).

Almost surely, 2^2647965661 is an apocalyptic number.

It is an amenable number.

2647965661 is a deficient number, since it is larger than the sum of its proper divisors (292454435).

2647965661 is a wasteful number, since it uses less digits than its factorization.

2647965661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12864.

The product of its digits is 3265920, while the sum is 52.

The square root of 2647965661 is about 51458.3876642088. The cubic root of 2647965661 is about 1383.4733030222.

The spelling of 2647965661 in words is "two billion, six hundred forty-seven million, nine hundred sixty-five thousand, six hundred sixty-one".