2581778523 has 16 divisors (see below), whose sum is σ = 3549338496. Its totient is φ = 1668313920.

The previous prime is 2581778519. The next prime is 2581778527. The reversal of 2581778523 is 3258771852.

2581778523 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2581778519) and next prime (2581778527).

It is not a de Polignac number, because 2581778523 - 2² = 2581778519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2581778527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 59490 + ... + 93287.

It is an arithmetic number, because the mean of its divisors is an integer number (221833656).

Almost surely, 2^2581778523 is an apocalyptic number.

2581778523 is a deficient number, since it is larger than the sum of its proper divisors (967559973).

2581778523 is a wasteful number, since it uses less digits than its factorization.

2581778523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152954.

The product of its digits is 940800, while the sum is 48.

The square root of 2581778523 is about 50811.2046993574. The cubic root of 2581778523 is about 1371.8490533318.

The spelling of 2581778523 in words is "two billion, five hundred eighty-one million, seven hundred seventy-eight thousand, five hundred twenty-three".