2516633271721 has 2 divisors, whose sum is σ = 2516633271722. Its totient is φ = 2516633271720.

The previous prime is 2516633271697. The next prime is 2516633271727. The reversal of 2516633271721 is 1271723366152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2509258756096 + 7374515625 = 1584064^2 + 85875^2 .

It is a cyclic number.

It is not a de Polignac number, because 2516633271721 - 2¹¹ = 2516633269673 is a prime.

It is not a weakly prime, because it can be changed into another prime (2516633271727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1258316635860 + 1258316635861.

It is an arithmetic number, because the mean of its divisors is an integer number (1258316635861).

Almost surely, 2^{2516633271721} is an apocalyptic number.

It is an amenable number.

2516633271721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2516633271721 is an equidigital number, since it uses as much as digits as its factorization.

2516633271721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 635040, while the sum is 46.

The spelling of 2516633271721 in words is "two trillion, five hundred sixteen billion, six hundred thirty-three million, two hundred seventy-one thousand, seven hundred twenty-one".