28677277661 has 2 divisors, whose sum is σ = 28677277662. Its totient is φ = 28677277660.

The previous prime is 28677277597. The next prime is 28677277823. The reversal of 28677277661 is 16677277682.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23652594436 + 5024683225 = 153794^2 + 70885^2 .

It is a cyclic number.

It is not a de Polignac number, because 28677277661 - 2⁶ = 28677277597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28677277661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28677277861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14338638830 + 14338638831.

It is an arithmetic number, because the mean of its divisors is an integer number (14338638831).

Almost surely, 2^28677277661 is an apocalyptic number.

It is an amenable number.

28677277661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28677277661 is an equidigital number, since it uses as much as digits as its factorization.

28677277661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16595712, while the sum is 59.

The spelling of 28677277661 in words is "twenty-eight billion, six hundred seventy-seven million, two hundred seventy-seven thousand, six hundred sixty-one".