2604866591 has 4 divisors (see below), whose sum is σ = 2647569384. Its totient is φ = 2562163800.

The previous prime is 2604866573. The next prime is 2604866609. The reversal of 2604866591 is 1956684062.

2604866591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2604866573) and next prime (2604866609).

It is a cyclic number.

It is not a de Polignac number, because 2604866591 - 2¹⁴ = 2604850207 is a prime.

It is a super-2 number, since 2×2604866591² = 13570659913815922562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2604866291) 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, 21351305 + ... + 21351426.

It is an arithmetic number, because the mean of its divisors is an integer number (661892346).

Almost surely, 2^2604866591 is an apocalyptic number.

2604866591 is a deficient number, since it is larger than the sum of its proper divisors (42702793).

2604866591 is an equidigital number, since it uses as much as digits as its factorization.

2604866591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42702792.

The product of its (nonzero) digits is 622080, while the sum is 47.

The square root of 2604866591 is about 51037.8936771493. The cubic root of 2604866591 is about 1375.9262679571.

The spelling of 2604866591 in words is "two billion, six hundred four million, eight hundred sixty-six thousand, five hundred ninety-one".