26551906861 has 2 divisors, whose sum is σ = 26551906862. Its totient is φ = 26551906860.

The previous prime is 26551906847. The next prime is 26551906879. The reversal of 26551906861 is 16860915562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21196448100 + 5355458761 = 145590^2 + 73181^2 .

It is a cyclic number.

It is not a de Polignac number, because 26551906861 - 2¹⁹ = 26551382573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26551906361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13275953430 + 13275953431.

It is an arithmetic number, because the mean of its divisors is an integer number (13275953431).

Almost surely, 2^26551906861 is an apocalyptic number.

It is an amenable number.

26551906861 is a deficient number, since it is larger than the sum of its proper divisors (1).

26551906861 is an equidigital number, since it uses as much as digits as its factorization.

26551906861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 777600, while the sum is 49.

The spelling of 26551906861 in words is "twenty-six billion, five hundred fifty-one million, nine hundred six thousand, eight hundred sixty-one".