47516556421 has 2 divisors, whose sum is σ = 47516556422. Its totient is φ = 47516556420.

The previous prime is 47516556379. The next prime is 47516556443. The reversal of 47516556421 is 12465561574.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 33520483396 + 13996073025 = 183086^2 + 118305^2 .

It is a cyclic number.

It is not a de Polignac number, because 47516556421 - 2⁷ = 47516556293 is a prime.

It is a super-2 number, since 2×47516556421² (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 (47516556721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23758278210 + 23758278211.

It is an arithmetic number, because the mean of its divisors is an integer number (23758278211).

Almost surely, 2^47516556421 is an apocalyptic number.

It is an amenable number.

47516556421 is a deficient number, since it is larger than the sum of its proper divisors (1).

47516556421 is an equidigital number, since it uses as much as digits as its factorization.

47516556421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008000, while the sum is 46.

The spelling of 47516556421 in words is "forty-seven billion, five hundred sixteen million, five hundred fifty-six thousand, four hundred twenty-one".