2606781911 has 4 divisors (see below), whose sum is σ = 2611903800. Its totient is φ = 2601660024.

The previous prime is 2606781857. The next prime is 2606781923. The reversal of 2606781911 is 1191876062.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2606781911 - 2¹⁸ = 2606519767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2606781811) 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 in 3 ways as a sum of consecutive naturals, for example, 2560181 + ... + 2561198.

It is an arithmetic number, because the mean of its divisors is an integer number (652975950).

Almost surely, 2^2606781911 is an apocalyptic number.

2606781911 is a deficient number, since it is larger than the sum of its proper divisors (5121889).

2606781911 is an equidigital number, since it uses as much as digits as its factorization.

2606781911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5121888.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 2606781911 is about 51056.6539346244. The cubic root of 2606781911 is about 1376.2634181032.

The spelling of 2606781911 in words is "two billion, six hundred six million, seven hundred eighty-one thousand, nine hundred eleven".