26193156649 has 9 divisors (see below), whose sum is σ = 28792782039. Its totient is φ = 23810342160.

The previous prime is 26193156641. The next prime is 26193156653. The reversal of 26193156649 is 94665139162.

It is a happy number.

The square root of 26193156649 is 161843.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 19408669225 + 6784487424 = 139315^2 + 82368^2 .

It is not a de Polignac number, because 26193156649 - 2³ = 26193156641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 26193156596 and 26193156605.

It is not an unprimeable number, because it can be changed into a prime (26193156641) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1772917 + ... + 1787629.

Almost surely, 2^26193156649 is an apocalyptic number.

26193156649 is the 161843-rd square number.

26193156649 is the 80922-nd centered octagonal number.

It is an amenable number.

26193156649 is a deficient number, since it is larger than the sum of its proper divisors (2599625390).

26193156649 is an frugal number, since it uses more digits than its factorization.

26193156649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29448 (or 14724 counting only the distinct ones).

The product of its digits is 2099520, while the sum is 52.

The spelling of 26193156649 in words is "twenty-six billion, one hundred ninety-three million, one hundred fifty-six thousand, six hundred forty-nine".