611016009991 has 2 divisors, whose sum is σ = 611016009992. Its totient is φ = 611016009990.

The previous prime is 611016009943. The next prime is 611016010009. The reversal of 611016009991 is 199900610116.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 611016009991 - 2²³ = 611007621383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (611016009911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305508004995 + 305508004996.

It is an arithmetic number, because the mean of its divisors is an integer number (305508004996).

Almost surely, 2^611016009991 is an apocalyptic number.

611016009991 is a deficient number, since it is larger than the sum of its proper divisors (1).

611016009991 is an equidigital number, since it uses as much as digits as its factorization.

611016009991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 26244, while the sum is 43.

The spelling of 611016009991 in words is "six hundred eleven billion, sixteen million, nine thousand, nine hundred ninety-one".