2661210771 has 4 divisors (see below), whose sum is σ = 3548281032. Its totient is φ = 1774140512.

The previous prime is 2661210757. The next prime is 2661210817. The reversal of 2661210771 is 1770121662.

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 2661210771 - 2²¹ = 2659113619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2661210701) 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, 443535126 + ... + 443535131.

It is an arithmetic number, because the mean of its divisors is an integer number (887070258).

Almost surely, 2^2661210771 is an apocalyptic number.

2661210771 is a deficient number, since it is larger than the sum of its proper divisors (887070261).

2661210771 is an equidigital number, since it uses as much as digits as its factorization.

2661210771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 887070260.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 2661210771 is about 51586.9244188874. The cubic root of 2661210771 is about 1385.7761763009.

The spelling of 2661210771 in words is "two billion, six hundred sixty-one million, two hundred ten thousand, seven hundred seventy-one".