2660657 has 2 divisors, whose sum is σ = 2660658. Its totient is φ = 2660656.

The previous prime is 2660639. The next prime is 2660659. The reversal of 2660657 is 7560662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1597696 + 1062961 = 1264^2 + 1031^2 .

It is a cyclic number.

It is not a de Polignac number, because 2660657 - 2⁸ = 2660401 is a prime.

Together with 2660659, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2660659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1330328 + 1330329.

It is an arithmetic number, because the mean of its divisors is an integer number (1330329).

2^2660657 is an apocalyptic number.

It is an amenable number.

2660657 is a deficient number, since it is larger than the sum of its proper divisors (1).

2660657 is an equidigital number, since it uses as much as digits as its factorization.

2660657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 2660657 is about 1631.1520468675. The cubic root of 2660657 is about 138.5680047639.

The spelling of 2660657 in words is "two million, six hundred sixty thousand, six hundred fifty-seven".