2261661386 has 16 divisors (see below), whose sum is σ = 3404677536. Its totient is φ = 1126776816.

The previous prime is 2261661379. The next prime is 2261661397. The reversal of 2261661386 is 6831661622.

2261661386 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2261661386² = 10230224449846881992, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 883220 + ... + 885776.

It is an arithmetic number, because the mean of its divisors is an integer number (212792346).

Almost surely, 2^2261661386 is an apocalyptic number.

2261661386 is a deficient number, since it is larger than the sum of its proper divisors (1143016150).

2261661386 is a wasteful number, since it uses less digits than its factorization.

2261661386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3973.

The product of its digits is 124416, while the sum is 41.

The square root of 2261661386 is about 47556.9278444266. The cubic root of 2261661386 is about 1312.6306104459.

The spelling of 2261661386 in words is "two billion, two hundred sixty-one million, six hundred sixty-one thousand, three hundred eighty-six".