26830665509 has 4 divisors (see below), whose sum is σ = 27696170880. Its totient is φ = 25965160140.

The previous prime is 26830665493. The next prime is 26830665523. The reversal of 26830665509 is 90556603862.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 26830665509 - 2⁴ = 26830665493 is a prime.

It is a super-2 number, since 2×26830665509² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26830665809) 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, 432752639 + ... + 432752700.

It is an arithmetic number, because the mean of its divisors is an integer number (6924042720).

Almost surely, 2^26830665509 is an apocalyptic number.

It is an amenable number.

26830665509 is a deficient number, since it is larger than the sum of its proper divisors (865505371).

26830665509 is an equidigital number, since it uses as much as digits as its factorization.

26830665509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 865505370.

The product of its (nonzero) digits is 2332800, while the sum is 50.

The spelling of 26830665509 in words is "twenty-six billion, eight hundred thirty million, six hundred sixty-five thousand, five hundred nine".