2665757761 has 4 divisors (see below), whose sum is σ = 2667700692. Its totient is φ = 2663814832.

The previous prime is 2665757747. The next prime is 2665757771. The reversal of 2665757761 is 1677575662.

It is a happy number.

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 2444313600 + 221444161 = 49440^2 + 14881^2 .

It is a cyclic number.

It is not a de Polignac number, because 2665757761 - 2⁹ = 2665757249 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2665757699 and 2665757708.

It is not an unprimeable number, because it can be changed into a prime (2665757701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 969406 + ... + 972151.

It is an arithmetic number, because the mean of its divisors is an integer number (666925173).

Almost surely, 2^2665757761 is an apocalyptic number.

It is an amenable number.

2665757761 is a deficient number, since it is larger than the sum of its proper divisors (1942931).

2665757761 is a wasteful number, since it uses less digits than its factorization.

2665757761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942930.

The product of its digits is 3704400, while the sum is 52.

The square root of 2665757761 is about 51630.9767581439. The cubic root of 2665757761 is about 1386.5649808003.

The spelling of 2665757761 in words is "two billion, six hundred sixty-five million, seven hundred fifty-seven thousand, seven hundred sixty-one".