566121665 has 8 divisors (see below), whose sum is σ = 686072808. Its totient is φ = 448412800.

The previous prime is 566121637. The next prime is 566121667.

566121665 is nontrivially palindromic in base 10.

It can be written as a sum of positive squares in 4 ways, for example, as 241833601 + 324288064 = 15551^2 + 18008^2 .

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

It is not a de Polignac number, because 566121665 - 2⁶ = 566121601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (566121667) 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, 560012 + ... + 561021.

It is an arithmetic number, because the mean of its divisors is an integer number (85759101).

Almost surely, 2^566121665 is an apocalyptic number.

It is an amenable number.

566121665 is a deficient number, since it is larger than the sum of its proper divisors (119951143).

566121665 is a wasteful number, since it uses less digits than its factorization.

566121665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121139.

The product of its digits is 64800, while the sum is 38.

The square root of 566121665 is about 23793.3113500412. The cubic root of 566121665 is about 827.2496493820.

The spelling of 566121665 in words is "five hundred sixty-six million, one hundred twenty-one thousand, six hundred sixty-five".