2580123778 has 4 divisors (see below), whose sum is σ = 3870185670. Its totient is φ = 1290061888.

The previous prime is 2580123773. The next prime is 2580123787. The reversal of 2580123778 is 8773210852.

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., 2223782649 + 356341129 = 47157^2 + 18877^2 .

It is not an unprimeable number, because it can be changed into a prime (2580123773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 645030943 + ... + 645030946.

Almost surely, 2^2580123778 is an apocalyptic number.

2580123778 is a deficient number, since it is larger than the sum of its proper divisors (1290061892).

2580123778 is a wasteful number, since it uses less digits than its factorization.

2580123778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1290061891.

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 2580123778 is about 50794.9188206852. The cubic root of 2580123778 is about 1371.5559032805. Note that the first 3 decimals are identical.

The spelling of 2580123778 in words is "two billion, five hundred eighty million, one hundred twenty-three thousand, seven hundred seventy-eight".