532666661 has 4 divisors (see below), whose sum is σ = 564000012. Its totient is φ = 501333312.

The previous prime is 532666639. The next prime is 532666679. The reversal of 532666661 is 166666235.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 166666235 = 5 ⋅33333247.

It can be written as a sum of positive squares in 2 ways, for example, as 193738561 + 338928100 = 13919^2 + 18410^2 .

It is a cyclic number.

It is not a de Polignac number, because 532666661 - 2²⁶ = 465557797 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 (532666621) 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, 15666650 + ... + 15666683.

It is an arithmetic number, because the mean of its divisors is an integer number (141000003).

Almost surely, 2^532666661 is an apocalyptic number.

It is an amenable number.

532666661 is a deficient number, since it is larger than the sum of its proper divisors (31333351).

532666661 is a wasteful number, since it uses less digits than its factorization.

532666661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31333350.

The product of its digits is 233280, while the sum is 41.

The square root of 532666661 is about 23079.5723747213. The cubic root of 532666661 is about 810.6222222015.

The spelling of 532666661 in words is "five hundred thirty-two million, six hundred sixty-six thousand, six hundred sixty-one".