2581557290 has 32 divisors (see below), whose sum is σ = 5023786320. Its totient is φ = 949469184.

The previous prime is 2581557259. The next prime is 2581557301. The reversal of 2581557290 is 927551852.

It can be written as a sum of positive squares in 8 ways, for example, as 1615155721 + 966401569 = 40189^2 + 31087^2 .

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 15 ways as a sum of consecutive naturals, for example, 5225 + ... + 72044.

Almost surely, 2^2581557290 is an apocalyptic number.

2581557290 is a deficient number, since it is larger than the sum of its proper divisors (2442229030).

2581557290 is a wasteful number, since it uses less digits than its factorization.

2581557290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77546.

The product of its (nonzero) digits is 252000, while the sum is 44.

The square root of 2581557290 is about 50809.0276427329. The cubic root of 2581557290 is about 1371.8098675602.

The spelling of 2581557290 in words is "two billion, five hundred eighty-one million, five hundred fifty-seven thousand, two hundred ninety".