16826240657 has 4 divisors (see below), whose sum is σ = 17281003956. Its totient is φ = 16371477360.

The previous prime is 16826240623. The next prime is 16826240681. The reversal of 16826240657 is 75604262861.

It is a Cunningham number, because it is equal to 129716²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 15056271616 + 1769969041 = 122704^2 + 42071^2 .

It is a cyclic number.

It is not a de Polignac number, because 16826240657 - 2¹⁸ = 16825978513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16826260657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227381594 + ... + 227381667.

It is an arithmetic number, because the mean of its divisors is an integer number (4320250989).

Almost surely, 2^16826240657 is an apocalyptic number.

It is an amenable number.

16826240657 is a deficient number, since it is larger than the sum of its proper divisors (454763299).

16826240657 is an equidigital number, since it uses as much as digits as its factorization.

16826240657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454763298.

The product of its (nonzero) digits is 967680, while the sum is 47.

The spelling of 16826240657 in words is "sixteen billion, eight hundred twenty-six million, two hundred forty thousand, six hundred fifty-seven".