2605541657 has 4 divisors (see below), whose sum is σ = 2649703440. Its totient is φ = 2561379876.

The previous prime is 2605541651. The next prime is 2605541711. The reversal of 2605541657 is 7561455062.

2605541657 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2605541657 - 2⁸ = 2605541401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2605541651) 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, 22080803 + ... + 22080920.

It is an arithmetic number, because the mean of its divisors is an integer number (662425860).

Almost surely, 2^2605541657 is an apocalyptic number.

It is an amenable number.

2605541657 is a deficient number, since it is larger than the sum of its proper divisors (44161783).

2605541657 is an equidigital number, since it uses as much as digits as its factorization.

2605541657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44161782.

The product of its (nonzero) digits is 252000, while the sum is 41.

The square root of 2605541657 is about 51044.5066290193. The cubic root of 2605541657 is about 1376.0451173982.

The spelling of 2605541657 in words is "two billion, six hundred five million, five hundred forty-one thousand, six hundred fifty-seven".