2516661643 has 2 divisors, whose sum is σ = 2516661644. Its totient is φ = 2516661642.

The previous prime is 2516661611. The next prime is 2516661709. The reversal of 2516661643 is 3461666152.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2516661643 - 2⁵ = 2516661611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2516661596 and 2516661605.

It is not a weakly prime, because it can be changed into another prime (2516664643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1258330821 + 1258330822.

It is an arithmetic number, because the mean of its divisors is an integer number (1258330822).

Almost surely, 2^2516661643 is an apocalyptic number.

2516661643 is a deficient number, since it is larger than the sum of its proper divisors (1).

2516661643 is an equidigital number, since it uses as much as digits as its factorization.

2516661643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 40.

The square root of 2516661643 is about 50166.3397409060. The cubic root of 2516661643 is about 1360.2172452480.

The spelling of 2516661643 in words is "two billion, five hundred sixteen million, six hundred sixty-one thousand, six hundred forty-three".