2661166761 has 8 divisors (see below), whose sum is σ = 3870788064. Its totient is φ = 1612828320.

The previous prime is 2661166741. The next prime is 2661166777. The reversal of 2661166761 is 1676611662.

It is a happy number.

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

It is not a de Polignac number, because 2661166761 - 2¹³ = 2661158569 is a prime.

It is a super-2 number, since 2×2661166761² = 14163617059702462242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2661166721) 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, 40320676 + ... + 40320741.

It is an arithmetic number, because the mean of its divisors is an integer number (483848508).

Almost surely, 2^2661166761 is an apocalyptic number.

It is an amenable number.

2661166761 is a deficient number, since it is larger than the sum of its proper divisors (1209621303).

2661166761 is a wasteful number, since it uses less digits than its factorization.

2661166761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80641431.

The product of its digits is 108864, while the sum is 42.

The square root of 2661166761 is about 51586.4978555436. The cubic root of 2661166761 is about 1385.7685371282.

The spelling of 2661166761 in words is "two billion, six hundred sixty-one million, one hundred sixty-six thousand, seven hundred sixty-one".