2661264161 has 8 divisors (see below), whose sum is σ = 2775435264. Its totient is φ = 2548863360.

The previous prime is 2661264157. The next prime is 2661264233. The reversal of 2661264161 is 1614621662.

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 2661264161 - 2² = 2661264157 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2661264131) 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, 439505 + ... + 445518.

It is an arithmetic number, because the mean of its divisors is an integer number (346929408).

Almost surely, 2^2661264161 is an apocalyptic number.

It is an amenable number.

2661264161 is a deficient number, since it is larger than the sum of its proper divisors (114171103).

2661264161 is an equidigital number, since it uses as much as digits as its factorization.

2661264161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 885151.

The product of its digits is 20736, while the sum is 35.

The square root of 2661264161 is about 51587.4418923831. The cubic root of 2661264161 is about 1385.7854435231.

The spelling of 2661264161 in words is "two billion, six hundred sixty-one million, two hundred sixty-four thousand, one hundred sixty-one".