2605661743 has 4 divisors (see below), whose sum is σ = 2718951408. Its totient is φ = 2492372080.

The previous prime is 2605661719. The next prime is 2605661749. The reversal of 2605661743 is 3471665062.

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

It is a cyclic number.

It is not a de Polignac number, because 2605661743 - 2⁵ = 2605661711 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2605661696 and 2605661705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605661749) 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, 56644798 + ... + 56644843.

It is an arithmetic number, because the mean of its divisors is an integer number (679737852).

Almost surely, 2^2605661743 is an apocalyptic number.

2605661743 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2605661743 is a deficient number, since it is larger than the sum of its proper divisors (113289665).

2605661743 is a wasteful number, since it uses less digits than its factorization.

2605661743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113289664.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 2605661743 is about 51045.6829026706. The cubic root of 2605661743 is about 1376.0662571121.

The spelling of 2605661743 in words is "two billion, six hundred five million, six hundred sixty-one thousand, seven hundred forty-three".