616711643 has 2 divisors, whose sum is σ = 616711644. Its totient is φ = 616711642.

The previous prime is 616711631. The next prime is 616711691. The reversal of 616711643 is 346117616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 616711643 - 2⁸ = 616711387 is a prime.

It is a super-2 number, since 2×616711643² = 760666501223518898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (616711603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 308355821 + 308355822.

It is an arithmetic number, because the mean of its divisors is an integer number (308355822).

Almost surely, 2^616711643 is an apocalyptic number.

616711643 is a deficient number, since it is larger than the sum of its proper divisors (1).

616711643 is an equidigital number, since it uses as much as digits as its factorization.

616711643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18144, while the sum is 35.

The square root of 616711643 is about 24833.6796105611. The cubic root of 616711643 is about 851.1917046826.

The spelling of 616711643 in words is "six hundred sixteen million, seven hundred eleven thousand, six hundred forty-three".