2661161500 has 24 divisors (see below), whose sum is σ = 5811977808. Its totient is φ = 1064464400.

The previous prime is 2661161497. The next prime is 2661161507. The reversal of 2661161500 is 51611662.

2661161500 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 (2661161507) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2660662 + ... + 2661661.

It is an arithmetic number, because the mean of its divisors is an integer number (242165742).

Almost surely, 2^2661161500 is an apocalyptic number.

2661161500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2661161500 is an abundant number, since it is smaller than the sum of its proper divisors (3150816308).

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

2661161500 is a wasteful number, since it uses less digits than its factorization.

2661161500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5322342 (or 5322330 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 2661161500 is about 51586.4468634931. The cubic root of 2661161500 is about 1385.7676239281.

The spelling of 2661161500 in words is "two billion, six hundred sixty-one million, one hundred sixty-one thousand, five hundred".