826440661 has 2 divisors, whose sum is σ = 826440662. Its totient is φ = 826440660.

The previous prime is 826440631. The next prime is 826440683. The reversal of 826440661 is 166044628.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 724632561 + 101808100 = 26919^2 + 10090^2 .

It is a cyclic number.

It is not a de Polignac number, because 826440661 - 2¹³ = 826432469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 826440661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (826440631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413220330 + 413220331.

It is an arithmetic number, because the mean of its divisors is an integer number (413220331).

Almost surely, 2^826440661 is an apocalyptic number.

It is an amenable number.

826440661 is a deficient number, since it is larger than the sum of its proper divisors (1).

826440661 is an equidigital number, since it uses as much as digits as its factorization.

826440661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 826440661 is about 28747.8809827785. The cubic root of 826440661 is about 938.4343414098.

The spelling of 826440661 in words is "eight hundred twenty-six million, four hundred forty thousand, six hundred sixty-one".