826640641 has 2 divisors, whose sum is σ = 826640642. Its totient is φ = 826640640.

The previous prime is 826640603. The next prime is 826640669. The reversal of 826640641 is 146046628.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 740057616 + 86583025 = 27204^2 + 9305^2 .

It is a cyclic number.

It is not a de Polignac number, because 826640641 - 2²³ = 818252033 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 826640641.

It is not a weakly prime, because it can be changed into another prime (826640671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413320320 + 413320321.

It is an arithmetic number, because the mean of its divisors is an integer number (413320321).

Almost surely, 2^826640641 is an apocalyptic number.

It is an amenable number.

826640641 is a deficient number, since it is larger than the sum of its proper divisors (1).

826640641 is an equidigital number, since it uses as much as digits as its factorization.

826640641 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 826640641 is about 28751.3589417961. The cubic root of 826640641 is about 938.5100286201.

The spelling of 826640641 in words is "eight hundred twenty-six million, six hundred forty thousand, six hundred forty-one".