28245456691 has 2 divisors, whose sum is σ = 28245456692. Its totient is φ = 28245456690.

The previous prime is 28245456671. The next prime is 28245456703. The reversal of 28245456691 is 19665454282.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28245456691 - 2³¹ = 26097973043 is a prime.

It is not a weakly prime, because it can be changed into another prime (28245456611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14122728345 + 14122728346.

It is an arithmetic number, because the mean of its divisors is an integer number (14122728346).

Almost surely, 2^28245456691 is an apocalyptic number.

28245456691 is a deficient number, since it is larger than the sum of its proper divisors (1).

28245456691 is an equidigital number, since it uses as much as digits as its factorization.

28245456691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4147200, while the sum is 52.

The spelling of 28245456691 in words is "twenty-eight billion, two hundred forty-five million, four hundred fifty-six thousand, six hundred ninety-one".