47718565861261 has 2 divisors, whose sum is σ = 47718565861262. Its totient is φ = 47718565861260.

The previous prime is 47718565861243. The next prime is 47718565861349. The reversal of 47718565861261 is 16216856581774.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42063253813161 + 5655312048100 = 6485619^2 + 2378090^2 .

It is a cyclic number.

It is not a de Polignac number, because 47718565861261 - 2¹¹ = 47718565859213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47718565861061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23859282930630 + 23859282930631.

It is an arithmetic number, because the mean of its divisors is an integer number (23859282930631).

Almost surely, 2^{47718565861261} is an apocalyptic number.

It is an amenable number.

47718565861261 is a deficient number, since it is larger than the sum of its proper divisors (1).

47718565861261 is an equidigital number, since it uses as much as digits as its factorization.

47718565861261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 135475200, while the sum is 67.

The spelling of 47718565861261 in words is "forty-seven trillion, seven hundred eighteen billion, five hundred sixty-five million, eight hundred sixty-one thousand, two hundred sixty-one".