611611643 has 2 divisors, whose sum is σ = 611611644. Its totient is φ = 611611642.

The previous prime is 611611633. The next prime is 611611673. The reversal of 611611643 is 346116116.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 611611643 - 2²⁰ = 610563067 is a prime.

It is not a weakly prime, because it can be changed into another prime (611611613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305805821 + 305805822.

It is an arithmetic number, because the mean of its divisors is an integer number (305805822).

Almost surely, 2^611611643 is an apocalyptic number.

611611643 is a deficient number, since it is larger than the sum of its proper divisors (1).

611611643 is an equidigital number, since it uses as much as digits as its factorization.

611611643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 611611643 is about 24730.7833074490. The cubic root of 611611643 is about 848.8388495854.

Adding to 611611643 its reverse (346116116), we get a palindrome (957727759).

The spelling of 611611643 in words is "six hundred eleven million, six hundred eleven thousand, six hundred forty-three".