2656237649 has 8 divisors (see below), whose sum is σ = 2861810280. Its totient is φ = 2450843136.

The previous prime is 2656237609. The next prime is 2656237651. The reversal of 2656237649 is 9467326562.

2656237649 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 150234049 + 2506003600 = 12257^2 + 50060^2 .

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 2656237649 - 2⁸ = 2656237393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2656237597 and 2656237606.

It is not an unprimeable number, because it can be changed into a prime (2656237609) 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, 12704 + ... + 73985.

It is an arithmetic number, because the mean of its divisors is an integer number (357726285).

Almost surely, 2^2656237649 is an apocalyptic number.

It is an amenable number.

2656237649 is a deficient number, since it is larger than the sum of its proper divisors (205572631).

2656237649 is a wasteful number, since it uses less digits than its factorization.

2656237649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89059.

The product of its digits is 3265920, while the sum is 50.

The square root of 2656237649 is about 51538.7004977813. The cubic root of 2656237649 is about 1384.9124176655.

The spelling of 2656237649 in words is "two billion, six hundred fifty-six million, two hundred thirty-seven thousand, six hundred forty-nine".