2581165500 has 48 divisors (see below), whose sum is σ = 7516358304. Its totient is φ = 688310400.

The previous prime is 2581165487. The next prime is 2581165541. The reversal of 2581165500 is 55611852.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 858889 + ... + 861888.

It is an arithmetic number, because the mean of its divisors is an integer number (156590798).

Almost surely, 2^2581165500 is an apocalyptic number.

2581165500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2581165500 is an abundant number, since it is smaller than the sum of its proper divisors (4935192804).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2581165500 is a wasteful number, since it uses less digits than its factorization.

2581165500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1720799 (or 1720787 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 33.

The square root of 2581165500 is about 50805.1719808131. The cubic root of 2581165500 is about 1371.7404664818.

The spelling of 2581165500 in words is "two billion, five hundred eighty-one million, one hundred sixty-five thousand, five hundred".