2601643657 has 2 divisors, whose sum is σ = 2601643658. Its totient is φ = 2601643656.

The previous prime is 2601643619. The next prime is 2601643711. The reversal of 2601643657 is 7563461062.

2601643657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2591217216 + 10426441 = 50904^2 + 3229^2 .

It is a cyclic number.

It is not a de Polignac number, because 2601643657 - 2⁷ = 2601643529 is a prime.

It is not a weakly prime, because it can be changed into another prime (2601643607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1300821828 + 1300821829.

It is an arithmetic number, because the mean of its divisors is an integer number (1300821829).

Almost surely, 2^2601643657 is an apocalyptic number.

It is an amenable number.

2601643657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2601643657 is an equidigital number, since it uses as much as digits as its factorization.

2601643657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 2601643657 is about 51006.3099723946. The cubic root of 2601643657 is about 1375.3585677751.

The spelling of 2601643657 in words is "two billion, six hundred one million, six hundred forty-three thousand, six hundred fifty-seven".