2661558256 has 80 divisors (see below), whose sum is σ = 6010329600. Its totient is φ = 1118234880.

The previous prime is 2661558203. The next prime is 2661558257. The reversal of 2661558256 is 6528551662.

2661558256 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2661558257) 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, 1565695 + ... + 1567393.

It is an arithmetic number, because the mean of its divisors is an integer number (75129120).

Almost surely, 2^2661558256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2661558256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3005164800).

2661558256 is an abundant number, since it is smaller than the sum of its proper divisors (3348771344).

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

2661558256 is a wasteful number, since it uses less digits than its factorization.

2661558256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1982 (or 1976 counting only the distinct ones).

The product of its digits is 864000, while the sum is 46.

The square root of 2661558256 is about 51590.2922651151. The cubic root of 2661558256 is about 1385.8364891332.

The spelling of 2661558256 in words is "two billion, six hundred sixty-one million, five hundred fifty-eight thousand, two hundred fifty-six".