2791347665 has 12 divisors (see below), whose sum is σ = 3535193844. Its totient is φ = 2115546336.

The previous prime is 2791347641. The next prime is 2791347667. The reversal of 2791347665 is 5667431972.

It can be written as a sum of positive squares in 2 ways, for example, as 787531969 + 2003815696 = 28063^2 + 44764^2 .

It is not a de Polignac number, because 2791347665 - 2¹⁴ = 2791331281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2791347667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 771422 + ... + 775031.

It is an arithmetic number, because the mean of its divisors is an integer number (294599487).

Almost surely, 2^2791347665 is an apocalyptic number.

It is an amenable number.

2791347665 is a deficient number, since it is larger than the sum of its proper divisors (743846179).

2791347665 is a wasteful number, since it uses less digits than its factorization.

2791347665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546496 (or 1546477 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 50.

The square root of 2791347665 is about 52833.2060829172. The cubic root of 2791347665 is about 1408.0064486794.

The spelling of 2791347665 in words is "two billion, seven hundred ninety-one million, three hundred forty-seven thousand, six hundred sixty-five".