27654898961 has 2 divisors, whose sum is σ = 27654898962. Its totient is φ = 27654898960.

The previous prime is 27654898913. The next prime is 27654898963. The reversal of 27654898961 is 16989845672.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25887201025 + 1767697936 = 160895^2 + 42044^2 .

It is a cyclic number.

It is not a de Polignac number, because 27654898961 - 2³⁴ = 10475029777 is a prime.

It is a Sophie Germain prime.

Together with 27654898963, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27654898963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13827449480 + 13827449481.

It is an arithmetic number, because the mean of its divisors is an integer number (13827449481).

Almost surely, 2^27654898961 is an apocalyptic number.

It is an amenable number.

27654898961 is a deficient number, since it is larger than the sum of its proper divisors (1).

27654898961 is an equidigital number, since it uses as much as digits as its factorization.

27654898961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52254720, while the sum is 65.

The spelling of 27654898961 in words is "twenty-seven billion, six hundred fifty-four million, eight hundred ninety-eight thousand, nine hundred sixty-one".