2665155815 has 48 divisors (see below), whose sum is σ = 3797704800. Its totient is φ = 1789869312.

The previous prime is 2665155811. The next prime is 2665155817. The reversal of 2665155815 is 5185515662.

It is not a de Polignac number, because 2665155815 - 2² = 2665155811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2665155811) 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 47 ways as a sum of consecutive naturals, for example, 3758681 + ... + 3759389.

It is an arithmetic number, because the mean of its divisors is an integer number (79118850).

Almost surely, 2^2665155815 is an apocalyptic number.

2665155815 is a deficient number, since it is larger than the sum of its proper divisors (1132548985).

2665155815 is a wasteful number, since it uses less digits than its factorization.

2665155815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1024 (or 1017 counting only the distinct ones).

The product of its digits is 360000, while the sum is 44.

The square root of 2665155815 is about 51625.1471184344. The cubic root of 2665155815 is about 1386.4606077166.

The spelling of 2665155815 in words is "two billion, six hundred sixty-five million, one hundred fifty-five thousand, eight hundred fifteen".