2563983985 has 4 divisors (see below), whose sum is σ = 3076780788. Its totient is φ = 2051187184.

The previous prime is 2563983977. The next prime is 2563984019. The reversal of 2563983985 is 5893893652.

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

It can be written as a sum of positive squares in 2 ways, for example, as 670602816 + 1893381169 = 25896^2 + 43513^2 .

It is a cyclic number.

It is not a de Polignac number, because 2563983985 - 2³ = 2563983977 is a prime.

It is a Smith number, since the sum of its digits (58) 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 256398394 + ... + 256398403.

It is an arithmetic number, because the mean of its divisors is an integer number (769195197).

Almost surely, 2^2563983985 is an apocalyptic number.

It is an amenable number.

2563983985 is a deficient number, since it is larger than the sum of its proper divisors (512796803).

2563983985 is an equidigital number, since it uses as much as digits as its factorization.

2563983985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512796802.

The product of its digits is 13996800, while the sum is 58.

The square root of 2563983985 is about 50635.7974658245. The cubic root of 2563983985 is about 1368.6900268823.

The spelling of 2563983985 in words is "two billion, five hundred sixty-three million, nine hundred eighty-three thousand, nine hundred eighty-five".