616959643 has 2 divisors, whose sum is σ = 616959644. Its totient is φ = 616959642.

The previous prime is 616959641. The next prime is 616959649. The reversal of 616959643 is 346959616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 616959643 - 2¹ = 616959641 is a prime.

Together with 616959641, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (616959641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308479821 + 308479822.

It is an arithmetic number, because the mean of its divisors is an integer number (308479822).

Almost surely, 2^616959643 is an apocalyptic number.

616959643 is a deficient number, since it is larger than the sum of its proper divisors (1).

616959643 is an equidigital number, since it uses as much as digits as its factorization.

616959643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1049760, while the sum is 49.

The square root of 616959643 is about 24838.6723276426. The cubic root of 616959643 is about 851.3057867690.

The spelling of 616959643 in words is "six hundred sixteen million, nine hundred fifty-nine thousand, six hundred forty-three".