26440564651 has 4 divisors (see below), whose sum is σ = 26441131752. Its totient is φ = 26439997552.

The previous prime is 26440564643. The next prime is 26440564691. The reversal of 26440564651 is 15646504462.

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

It is a cyclic number.

It is not a de Polignac number, because 26440564651 - 2³ = 26440564643 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26440564598 and 26440564607.

It is not an unprimeable number, because it can be changed into a prime (26440564621) 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, 206665 + ... + 309178.

It is an arithmetic number, because the mean of its divisors is an integer number (6610282938).

Almost surely, 2^26440564651 is an apocalyptic number.

26440564651 is a deficient number, since it is larger than the sum of its proper divisors (567101).

26440564651 is an equidigital number, since it uses as much as digits as its factorization.

26440564651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567100.

The product of its (nonzero) digits is 691200, while the sum is 43.

The spelling of 26440564651 in words is "twenty-six billion, four hundred forty million, five hundred sixty-four thousand, six hundred fifty-one".