2581355578 has 8 divisors (see below), whose sum is σ = 3873423168. Its totient is φ = 1290214524.

The previous prime is 2581355537. The next prime is 2581355587. The reversal of 2581355578 is 8755531852.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 224626 + ... + 235837.

It is an arithmetic number, because the mean of its divisors is an integer number (484177896).

Almost surely, 2^2581355578 is an apocalyptic number.

2581355578 is a deficient number, since it is larger than the sum of its proper divisors (1292067590).

2581355578 is a wasteful number, since it uses less digits than its factorization.

2581355578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463268.

The product of its digits is 1680000, while the sum is 49.

The square root of 2581355578 is about 50807.0426023794. The cubic root of 2581355578 is about 1371.7741374835.

The spelling of 2581355578 in words is "two billion, five hundred eighty-one million, three hundred fifty-five thousand, five hundred seventy-eight".