611909523691 has 2 divisors, whose sum is σ = 611909523692. Its totient is φ = 611909523690.

The previous prime is 611909523679. The next prime is 611909523817. The reversal of 611909523691 is 196325909116.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-611909523691 is a prime.

It is not a weakly prime, because it can be changed into another prime (611909523611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305954761845 + 305954761846.

It is an arithmetic number, because the mean of its divisors is an integer number (305954761846).

Almost surely, 2^611909523691 is an apocalyptic number.

611909523691 is a deficient number, since it is larger than the sum of its proper divisors (1).

611909523691 is an equidigital number, since it uses as much as digits as its factorization.

611909523691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 787320, while the sum is 52.

The spelling of 611909523691 in words is "six hundred eleven billion, nine hundred nine million, five hundred twenty-three thousand, six hundred ninety-one".