6661757 has 2 divisors, whose sum is σ = 6661758. Its totient is φ = 6661756.

The previous prime is 6661751. The next prime is 6661771. The reversal of 6661757 is 7571666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6661561 + 196 = 2581^2 + 14^2 .

It is a cyclic number.

It is not a de Polignac number, because 6661757 - 2⁴ = 6661741 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6661757.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6661751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330878 + 3330879.

It is an arithmetic number, because the mean of its divisors is an integer number (3330879).

Almost surely, 2^6661757 is an apocalyptic number.

It is an amenable number.

6661757 is a deficient number, since it is larger than the sum of its proper divisors (1).

6661757 is an equidigital number, since it uses as much as digits as its factorization.

6661757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 6661757 is about 2581.0379694999. The cubic root of 6661757 is about 188.1609926976.

Subtracting 6661757 from its reverse (7571666), we obtain a palindrome (909909).

The spelling of 6661757 in words is "six million, six hundred sixty-one thousand, seven hundred fifty-seven".