2749173661 has 4 divisors (see below), whose sum is σ = 2960648572. Its totient is φ = 2537698752.

The previous prime is 2749173629. The next prime is 2749173671. The reversal of 2749173661 is 1663719472.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 615288025 + 2133885636 = 24805^2 + 46194^2 .

It is a cyclic number.

It is not a de Polignac number, because 2749173661 - 2⁵ = 2749173629 is a prime.

It is a super-2 number, since 2×2749173661² = 15115911636672285842, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2749173671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 105737436 + ... + 105737461.

It is an arithmetic number, because the mean of its divisors is an integer number (740162143).

Almost surely, 2^2749173661 is an apocalyptic number.

It is an amenable number.

2749173661 is a deficient number, since it is larger than the sum of its proper divisors (211474911).

2749173661 is a wasteful number, since it uses less digits than its factorization.

2749173661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211474910.

The product of its digits is 381024, while the sum is 46.

The square root of 2749173661 is about 52432.5629833217. The cubic root of 2749173661 is about 1400.8793219134.

The spelling of 2749173661 in words is "two billion, seven hundred forty-nine million, one hundred seventy-three thousand, six hundred sixty-one".