2865531772809 has 12 divisors (see below), whose sum is σ = 4240055144052. Its totient is φ = 1863760502400.

The previous prime is 2865531772799. The next prime is 2865531772837. The reversal of 2865531772809 is 9082771355682.

2865531772809 is a `hidden beast` number, since 2 + 8 + 6 + 5 + 531 + 77 + 28 + 0 + 9 = 666.

2865531772809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 1724042528784 + 1141489244025 = 1313028^2 + 1068405^2 .

It is not a de Polignac number, because 2865531772809 - 2⁵ = 2865531772777 is a prime.

It is a super-2 number, since 2×2865531772809² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2865531772879) 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, 3882834012 + ... + 3882834749.

It is an arithmetic number, because the mean of its divisors is an integer number (353337928671).

Almost surely, 2^{2865531772809} is an apocalyptic number.

It is an amenable number.

2865531772809 is a deficient number, since it is larger than the sum of its proper divisors (1374523371243).

2865531772809 is a wasteful number, since it uses less digits than its factorization.

2865531772809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7765668808 (or 7765668805 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 63.

The spelling of 2865531772809 in words is "two trillion, eight hundred sixty-five billion, five hundred thirty-one million, seven hundred seventy-two thousand, eight hundred nine".