2640558871 has 4 divisors (see below), whose sum is σ = 2646072000. Its totient is φ = 2635045744.

The previous prime is 2640558853. The next prime is 2640558887. The reversal of 2640558871 is 1788550462.

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 2640558871 - 2⁹ = 2640558359 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 (2640558821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2755846 + ... + 2756803.

It is an arithmetic number, because the mean of its divisors is an integer number (661518000).

Almost surely, 2^2640558871 is an apocalyptic number.

2640558871 is a deficient number, since it is larger than the sum of its proper divisors (5513129).

2640558871 is an equidigital number, since it uses as much as digits as its factorization.

2640558871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5513128.

The product of its (nonzero) digits is 537600, while the sum is 46.

The square root of 2640558871 is about 51386.3685329096. The cubic root of 2640558871 is about 1382.1821652611.

The spelling of 2640558871 in words is "two billion, six hundred forty million, five hundred fifty-eight thousand, eight hundred seventy-one".