26650216261 has 2 divisors, whose sum is σ = 26650216262. Its totient is φ = 26650216260.

The previous prime is 26650216249. The next prime is 26650216291. The reversal of 26650216261 is 16261205662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21171996036 + 5478220225 = 145506^2 + 74015^2 .

It is a cyclic number.

It is not a de Polignac number, because 26650216261 - 2⁷ = 26650216133 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 26650216261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (26650216291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13325108130 + 13325108131.

It is an arithmetic number, because the mean of its divisors is an integer number (13325108131).

Almost surely, 2^26650216261 is an apocalyptic number.

It is an amenable number.

26650216261 is a deficient number, since it is larger than the sum of its proper divisors (1).

26650216261 is an equidigital number, since it uses as much as digits as its factorization.

26650216261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 37.

The spelling of 26650216261 in words is "twenty-six billion, six hundred fifty million, two hundred sixteen thousand, two hundred sixty-one".