6581109779 has 2 divisors, whose sum is σ = 6581109780. Its totient is φ = 6581109778.

The previous prime is 6581109739. The next prime is 6581109791. The reversal of 6581109779 is 9779011856.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6581109779 is a prime.

It is a super-2 number, since 2×6581109779² = 86622011846498857682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6581109779.

It is not a weakly prime, because it can be changed into another prime (6581109719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3290554889 + 3290554890.

It is an arithmetic number, because the mean of its divisors is an integer number (3290554890).

Almost surely, 2^6581109779 is an apocalyptic number.

6581109779 is a deficient number, since it is larger than the sum of its proper divisors (1).

6581109779 is an equidigital number, since it uses as much as digits as its factorization.

6581109779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 952560, while the sum is 53.

The square root of 6581109779 is about 81124.0394642673. The cubic root of 6581109779 is about 1873.9861568691.

The spelling of 6581109779 in words is "six billion, five hundred eighty-one million, one hundred nine thousand, seven hundred seventy-nine".