28117557617701 has 2 divisors, whose sum is σ = 28117557617702. Its totient is φ = 28117557617700.

The previous prime is 28117557617671. The next prime is 28117557617707. The reversal of 28117557617701 is 10771675571182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19301699956900 + 8815857660801 = 4393370^2 + 2969151^2 .

It is a cyclic number.

It is not a de Polignac number, because 28117557617701 - 2⁹ = 28117557617189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28117557617707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14058778808850 + 14058778808851.

It is an arithmetic number, because the mean of its divisors is an integer number (14058778808851).

Almost surely, 2^{28117557617701} is an apocalyptic number.

It is an amenable number.

28117557617701 is a deficient number, since it is larger than the sum of its proper divisors (1).

28117557617701 is an equidigital number, since it uses as much as digits as its factorization.

28117557617701 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5762400, while the sum is 58.

The spelling of 28117557617701 in words is "twenty-eight trillion, one hundred seventeen billion, five hundred fifty-seven million, six hundred seventeen thousand, seven hundred one".