2866791721 has 4 divisors (see below), whose sum is σ = 2871812944. Its totient is φ = 2861770500.

The previous prime is 2866791703. The next prime is 2866791793. The reversal of 2866791721 is 1271976682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2866791721 - 2¹³ = 2866783529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2866795721) 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, 2509755 + ... + 2510896.

It is an arithmetic number, because the mean of its divisors is an integer number (717953236).

Almost surely, 2^2866791721 is an apocalyptic number.

It is an amenable number.

2866791721 is a deficient number, since it is larger than the sum of its proper divisors (5021223).

2866791721 is an equidigital number, since it uses as much as digits as its factorization.

2866791721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5021222.

The product of its digits is 508032, while the sum is 49.

The square root of 2866791721 is about 53542.4291660362. The cubic root of 2866791721 is about 1420.5789679358.

The spelling of 2866791721 in words is "two billion, eight hundred sixty-six million, seven hundred ninety-one thousand, seven hundred twenty-one".