26251781863 has 4 divisors (see below), whose sum is σ = 27098613568. Its totient is φ = 25404950160.

The previous prime is 26251781771. The next prime is 26251781887. The reversal of 26251781863 is 36818715262.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 26251781863 - 2¹³ = 26251773671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26251781363) 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, 423415806 + ... + 423415867.

It is an arithmetic number, because the mean of its divisors is an integer number (6774653392).

Almost surely, 2^26251781863 is an apocalyptic number.

26251781863 is a deficient number, since it is larger than the sum of its proper divisors (846831705).

26251781863 is an equidigital number, since it uses as much as digits as its factorization.

26251781863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846831704.

The product of its digits is 967680, while the sum is 49.

The spelling of 26251781863 in words is "twenty-six billion, two hundred fifty-one million, seven hundred eighty-one thousand, eight hundred sixty-three".