26391253866 has 32 divisors (see below), whose sum is σ = 56803560768. Its totient is φ = 8143875840.

The previous prime is 26391253817. The next prime is 26391253877. The reversal of 26391253866 is 66835219362.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2114580 + ... + 2127023.

It is an arithmetic number, because the mean of its divisors is an integer number (1775111274).

Almost surely, 2^26391253866 is an apocalyptic number.

26391253866 is an abundant number, since it is smaller than the sum of its proper divisors (30412306902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26391253866 is a wasteful number, since it uses less digits than its factorization.

26391253866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4241686.

The product of its digits is 2799360, while the sum is 51.

The spelling of 26391253866 in words is "twenty-six billion, three hundred ninety-one million, two hundred fifty-three thousand, eight hundred sixty-six".