28161910657 has 2 divisors, whose sum is σ = 28161910658. Its totient is φ = 28161910656.

The previous prime is 28161910649. The next prime is 28161910697. The reversal of 28161910657 is 75601916182.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 23937040656 + 4224870001 = 154716^2 + 64999^2 .

It is a cyclic number.

It is not a de Polignac number, because 28161910657 - 2³ = 28161910649 is a prime.

It is not a weakly prime, because it can be changed into another prime (28161910607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14080955328 + 14080955329.

It is an arithmetic number, because the mean of its divisors is an integer number (14080955329).

Almost surely, 2^28161910657 is an apocalyptic number.

It is an amenable number.

28161910657 is a deficient number, since it is larger than the sum of its proper divisors (1).

28161910657 is an equidigital number, since it uses as much as digits as its factorization.

28161910657 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 181440, while the sum is 46.

The spelling of 28161910657 in words is "twenty-eight billion, one hundred sixty-one million, nine hundred ten thousand, six hundred fifty-seven".