2562645989 has 4 divisors (see below), whose sum is σ = 2562755520. Its totient is φ = 2562536460.

The previous prime is 2562645971. The next prime is 2562645991. The reversal of 2562645989 is 9895462652.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2562645989 - 2²⁰ = 2561597413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2562645389) 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, 3959 + ... + 71700.

It is an arithmetic number, because the mean of its divisors is an integer number (640688880).

Almost surely, 2^2562645989 is an apocalyptic number.

It is an amenable number.

2562645989 is a deficient number, since it is larger than the sum of its proper divisors (109531).

2562645989 is an equidigital number, since it uses as much as digits as its factorization.

2562645989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109530.

The product of its digits is 9331200, while the sum is 56.

The square root of 2562645989 is about 50622.5837843151. The cubic root of 2562645989 is about 1368.4519052151.

The spelling of 2562645989 in words is "two billion, five hundred sixty-two million, six hundred forty-five thousand, nine hundred eighty-nine".