26215656797 has 4 divisors (see below), whose sum is σ = 28598898336. Its totient is φ = 23832415260.

The previous prime is 26215656787. The next prime is 26215656799. The reversal of 26215656797 is 79765651262.

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 26215656797 - 2¹⁰ = 26215655773 is a prime.

It is a super-2 number, since 2×26215656797² (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 (26215656799) 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, 1191620753 + ... + 1191620774.

It is an arithmetic number, because the mean of its divisors is an integer number (7149724584).

Almost surely, 2^26215656797 is an apocalyptic number.

It is an amenable number.

26215656797 is a deficient number, since it is larger than the sum of its proper divisors (2383241539).

26215656797 is a wasteful number, since it uses less digits than its factorization.

26215656797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2383241538.

The product of its digits is 9525600, while the sum is 56.

The spelling of 26215656797 in words is "twenty-six billion, two hundred fifteen million, six hundred fifty-six thousand, seven hundred ninety-seven".