985415916643 has 2 divisors, whose sum is σ = 985415916644. Its totient is φ = 985415916642.

The previous prime is 985415916619. The next prime is 985415916671. The reversal of 985415916643 is 346619514589.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (346619514589) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-985415916643 is a prime.

It is not a weakly prime, because it can be changed into another prime (985415916943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 492707958321 + 492707958322.

It is an arithmetic number, because the mean of its divisors is an integer number (492707958322).

Almost surely, 2^985415916643 is an apocalyptic number.

985415916643 is a deficient number, since it is larger than the sum of its proper divisors (1).

985415916643 is an equidigital number, since it uses as much as digits as its factorization.

985415916643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27993600, while the sum is 61.

The spelling of 985415916643 in words is "nine hundred eighty-five billion, four hundred fifteen million, nine hundred sixteen thousand, six hundred forty-three".