2528564657 has 4 divisors (see below), whose sum is σ = 2566304496. Its totient is φ = 2490824820.

The previous prime is 2528564653. The next prime is 2528564659. The reversal of 2528564657 is 7564658252.

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 2528564657 - 2² = 2528564653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2528564653) 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, 18869819 + ... + 18869952.

It is an arithmetic number, because the mean of its divisors is an integer number (641576124).

Almost surely, 2^2528564657 is an apocalyptic number.

It is an amenable number.

2528564657 is a deficient number, since it is larger than the sum of its proper divisors (37739839).

2528564657 is an equidigital number, since it uses as much as digits as its factorization.

2528564657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37739838.

The product of its digits is 4032000, while the sum is 50.

The square root of 2528564657 is about 50284.8352587537. The cubic root of 2528564657 is about 1362.3583390804.

The spelling of 2528564657 in words is "two billion, five hundred twenty-eight million, five hundred sixty-four thousand, six hundred fifty-seven".