2583216778 has 4 divisors (see below), whose sum is σ = 3874825170. Its totient is φ = 1291608388.

The previous prime is 2583216749. The next prime is 2583216781. The reversal of 2583216778 is 8776123852.

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

It can be written as a sum of positive squares in only one way, i.e., 2374905289 + 208311489 = 48733^2 + 14433^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645804193 + ... + 645804196.

Almost surely, 2^2583216778 is an apocalyptic number.

2583216778 is a deficient number, since it is larger than the sum of its proper divisors (1291608392).

2583216778 is a wasteful number, since it uses less digits than its factorization.

2583216778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1291608391.

The product of its digits is 1128960, while the sum is 49.

The square root of 2583216778 is about 50825.3556603395. The cubic root of 2583216778 is about 1372.1037488800.

The spelling of 2583216778 in words is "two billion, five hundred eighty-three million, two hundred sixteen thousand, seven hundred seventy-eight".