47220716581 has 2 divisors, whose sum is σ = 47220716582. Its totient is φ = 47220716580.

The previous prime is 47220716539. The next prime is 47220716633. The reversal of 47220716581 is 18561702274.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27370724481 + 19849992100 = 165441^2 + 140890^2 .

It is a cyclic number.

It is not a de Polignac number, because 47220716581 - 2¹³ = 47220708389 is a prime.

It is a super-2 number, since 2×47220716581² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47220716381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23610358290 + 23610358291.

It is an arithmetic number, because the mean of its divisors is an integer number (23610358291).

Almost surely, 2^47220716581 is an apocalyptic number.

It is an amenable number.

47220716581 is a deficient number, since it is larger than the sum of its proper divisors (1).

47220716581 is an equidigital number, since it uses as much as digits as its factorization.

47220716581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 188160, while the sum is 43.

The spelling of 47220716581 in words is "forty-seven billion, two hundred twenty million, seven hundred sixteen thousand, five hundred eighty-one".