7656661 has 2 divisors, whose sum is σ = 7656662. Its totient is φ = 7656660.

The previous prime is 7656653. The next prime is 7656673. The reversal of 7656661 is 1666567.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6812100 + 844561 = 2610^2 + 919^2 .

It is a cyclic number.

It is not a de Polignac number, because 7656661 - 2³ = 7656653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7656661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7656611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3828330 + 3828331.

It is an arithmetic number, because the mean of its divisors is an integer number (3828331).

Almost surely, 2^7656661 is an apocalyptic number.

It is an amenable number.

7656661 is a deficient number, since it is larger than the sum of its proper divisors (1).

7656661 is an equidigital number, since it uses as much as digits as its factorization.

7656661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 37.

The square root of 7656661 is about 2767.0672200003. The cubic root of 7656661 is about 197.0969057793.

The spelling of 7656661 in words is "seven million, six hundred fifty-six thousand, six hundred sixty-one".