28661302261 has 2 divisors, whose sum is σ = 28661302262. Its totient is φ = 28661302260.

The previous prime is 28661302213. The next prime is 28661302279. The reversal of 28661302261 is 16220316682.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24754302225 + 3907000036 = 157335^2 + 62506^2 .

It is a cyclic number.

It is not a de Polignac number, because 28661302261 - 2¹³ = 28661294069 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28661302261.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28661302361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14330651130 + 14330651131.

It is an arithmetic number, because the mean of its divisors is an integer number (14330651131).

Almost surely, 2^28661302261 is an apocalyptic number.

It is an amenable number.

28661302261 is a deficient number, since it is larger than the sum of its proper divisors (1).

28661302261 is an equidigital number, since it uses as much as digits as its factorization.

28661302261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41472, while the sum is 37.

The spelling of 28661302261 in words is "twenty-eight billion, six hundred sixty-one million, three hundred two thousand, two hundred sixty-one".