5661608765 has 8 divisors (see below), whose sum is σ = 6794351928. Its totient is φ = 4529006080.

The previous prime is 5661608747. The next prime is 5661608773. The reversal of 5661608765 is 5678061665.

It can be written as a sum of positive squares in 4 ways, for example, as 844832356 + 4816776409 = 29066^2 + 69403^2 .

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

It is not a de Polignac number, because 5661608765 - 2²⁶ = 5594499901 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102785 + ... + 147945.

It is an arithmetic number, because the mean of its divisors is an integer number (849293991).

Almost surely, 2^5661608765 is an apocalyptic number.

It is an amenable number.

5661608765 is a deficient number, since it is larger than the sum of its proper divisors (1132743163).

5661608765 is a wasteful number, since it uses less digits than its factorization.

5661608765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70239.

The product of its (nonzero) digits is 1814400, while the sum is 50.

The square root of 5661608765 is about 75243.6626235060. The cubic root of 5661608765 is about 1782.2964893383.

The spelling of 5661608765 in words is "five billion, six hundred sixty-one million, six hundred eight thousand, seven hundred sixty-five".