2749856161 has 8 divisors (see below), whose sum is σ = 2961985320. Its totient is φ = 2537812992.

The previous prime is 2749856159. The next prime is 2749856189. The reversal of 2749856161 is 1616589472.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 441630225 + 2308225936 = 21015^2 + 48044^2 .

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

It is not a de Polignac number, because 2749856161 - 2¹ = 2749856159 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2749856141) 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, 55041 + ... + 92353.

It is an arithmetic number, because the mean of its divisors is an integer number (370248165).

Almost surely, 2^2749856161 is an apocalyptic number.

It is an amenable number.

2749856161 is a deficient number, since it is larger than the sum of its proper divisors (212129159).

2749856161 is a wasteful number, since it uses less digits than its factorization.

2749856161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42995.

The product of its digits is 725760, while the sum is 49.

The square root of 2749856161 is about 52439.0709395199. The cubic root of 2749856161 is about 1400.9952380815.

The spelling of 2749856161 in words is "two billion, seven hundred forty-nine million, eight hundred fifty-six thousand, one hundred sixty-one".