117728327261 has 2 divisors, whose sum is σ = 117728327262. Its totient is φ = 117728327260.

The previous prime is 117728327219. The next prime is 117728327263. The reversal of 117728327261 is 162723827711.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 88146047236 + 29582280025 = 296894^2 + 171995^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-117728327261 is a prime.

It is a Sophie Germain prime.

Together with 117728327263, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (117728327263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 58864163630 + 58864163631.

It is an arithmetic number, because the mean of its divisors is an integer number (58864163631).

Almost surely, 2^117728327261 is an apocalyptic number.

It is an amenable number.

117728327261 is a deficient number, since it is larger than the sum of its proper divisors (1).

117728327261 is an equidigital number, since it uses as much as digits as its factorization.

117728327261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 47.

The spelling of 117728327261 in words is "one hundred seventeen billion, seven hundred twenty-eight million, three hundred twenty-seven thousand, two hundred sixty-one".