27959977261 has 2 divisors, whose sum is σ = 27959977262. Its totient is φ = 27959977260.

The previous prime is 27959977249. The next prime is 27959977369. The reversal of 27959977261 is 16277995972.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27605822500 + 354154761 = 166150^2 + 18819^2 .

It is a cyclic number.

It is not a de Polignac number, because 27959977261 - 2²³ = 27951588653 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 27959977193 and 27959977202.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27959977961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13979988630 + 13979988631.

It is an arithmetic number, because the mean of its divisors is an integer number (13979988631).

Almost surely, 2^27959977261 is an apocalyptic number.

It is an amenable number.

27959977261 is a deficient number, since it is larger than the sum of its proper divisors (1).

27959977261 is an equidigital number, since it uses as much as digits as its factorization.

27959977261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30005640, while the sum is 64.

The spelling of 27959977261 in words is "twenty-seven billion, nine hundred fifty-nine million, nine hundred seventy-seven thousand, two hundred sixty-one".