2605343865 has 32 divisors (see below), whose sum is σ = 4208236032. Its totient is φ = 1376352000.

The previous prime is 2605343849. The next prime is 2605343947. The reversal of 2605343865 is 5683435062.

2605343865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2605343865 - 2⁴ = 2605343849 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 733995 + ... + 737535.

It is an arithmetic number, because the mean of its divisors is an integer number (131507376).

Almost surely, 2^2605343865 is an apocalyptic number.

It is an amenable number.

2605343865 is a deficient number, since it is larger than the sum of its proper divisors (1602892167).

2605343865 is a wasteful number, since it uses less digits than its factorization.

2605343865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4001.

The product of its (nonzero) digits is 518400, while the sum is 42.

The square root of 2605343865 is about 51042.5691457630. The cubic root of 2605343865 is about 1376.0102970501.

The spelling of 2605343865 in words is "two billion, six hundred five million, three hundred forty-three thousand, eight hundred sixty-five".