2668261561 has 8 divisors (see below), whose sum is σ = 3209938880. Its totient is φ = 2166708528.

The previous prime is 2668261559. The next prime is 2668261567. The reversal of 2668261561 is 1651628662.

2668261561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2668261561 - 2¹ = 2668261559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2668261567) 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, 10030926 + ... + 10031191.

It is an arithmetic number, because the mean of its divisors is an integer number (401242360).

Almost surely, 2^2668261561 is an apocalyptic number.

It is an amenable number.

2668261561 is a deficient number, since it is larger than the sum of its proper divisors (541677319).

2668261561 is a wasteful number, since it uses less digits than its factorization.

2668261561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20062143.

The product of its digits is 207360, while the sum is 43.

The square root of 2668261561 is about 51655.2181391193. The cubic root of 2668261561 is about 1386.9989530960.

The spelling of 2668261561 in words is "two billion, six hundred sixty-eight million, two hundred sixty-one thousand, five hundred sixty-one".