2765751661 has 8 divisors (see below), whose sum is σ = 2778768440. Its totient is φ = 2752766208.

The previous prime is 2765751643. The next prime is 2765751671. The reversal of 2765751661 is 1661575672.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1350562500 + 1415189161 = 36750^2 + 37619^2 .

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 2765751661 - 2²⁵ = 2732197229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2765751601) 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, 179515 + ... + 194311.

It is an arithmetic number, because the mean of its divisors is an integer number (347346055).

Almost surely, 2^2765751661 is an apocalyptic number.

It is an amenable number.

2765751661 is a deficient number, since it is larger than the sum of its proper divisors (13016779).

2765751661 is a wasteful number, since it uses less digits than its factorization.

2765751661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15663.

The product of its digits is 529200, while the sum is 46.

The square root of 2765751661 is about 52590.4141550530. The cubic root of 2765751661 is about 1403.6895302238.

The spelling of 2765751661 in words is "two billion, seven hundred sixty-five million, seven hundred fifty-one thousand, six hundred sixty-one".