26190000805 has 16 divisors (see below), whose sum is σ = 33092225280. Its totient is φ = 19843192512.

The previous prime is 26190000803. The next prime is 26190000829. The reversal of 26190000805 is 50800009162.

It is a cyclic number.

It is not a de Polignac number, because 26190000805 - 2¹ = 26190000803 is a prime.

It is a super-2 number, since 2×26190000805² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26190000803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 283207 + ... + 364123.

It is an arithmetic number, because the mean of its divisors is an integer number (2068264080).

Almost surely, 2^26190000805 is an apocalyptic number.

26190000805 is the 80917-th decagonal number.

It is an amenable number.

26190000805 is a deficient number, since it is larger than the sum of its proper divisors (6902224475).

26190000805 is a wasteful number, since it uses less digits than its factorization.

26190000805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84348.

The product of its (nonzero) digits is 4320, while the sum is 31.

Adding to 26190000805 its reverse (50800009162), we get a palindrome (76990009967).

The spelling of 26190000805 in words is "twenty-six billion, one hundred ninety million, eight hundred five", and thus it is an aban number.