2661244871 has 4 divisors (see below), whose sum is σ = 2670327912. Its totient is φ = 2652161832.

The previous prime is 2661244867. The next prime is 2661244897. The reversal of 2661244871 is 1784421662.

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 2661244871 - 2² = 2661244867 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 (2661244811) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4541081 + ... + 4541666.

It is an arithmetic number, because the mean of its divisors is an integer number (667581978).

Almost surely, 2^2661244871 is an apocalyptic number.

2661244871 is a deficient number, since it is larger than the sum of its proper divisors (9083041).

2661244871 is an equidigital number, since it uses as much as digits as its factorization.

2661244871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9083040.

The product of its digits is 129024, while the sum is 41.

The square root of 2661244871 is about 51587.2549279374. The cubic root of 2661244871 is about 1385.7820952565.

The spelling of 2661244871 in words is "two billion, six hundred sixty-one million, two hundred forty-four thousand, eight hundred seventy-one".