1516551564991 has 2 divisors, whose sum is σ = 1516551564992. Its totient is φ = 1516551564990.

The previous prime is 1516551564977. The next prime is 1516551565043. The reversal of 1516551564991 is 1994651556151.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1516551564991 - 2⁵ = 1516551564959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1516551564791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 758275782495 + 758275782496.

It is an arithmetic number, because the mean of its divisors is an integer number (758275782496).

Almost surely, 2^{1516551564991} is an apocalyptic number.

1516551564991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1516551564991 is an equidigital number, since it uses as much as digits as its factorization.

1516551564991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7290000, while the sum is 58.

The spelling of 1516551564991 in words is "one trillion, five hundred sixteen billion, five hundred fifty-one million, five hundred sixty-four thousand, nine hundred ninety-one".