66233561 has 4 divisors (see below), whose sum is σ = 66326400. Its totient is φ = 66140724.

The previous prime is 66233551. The next prime is 66233579. The reversal of 66233561 is 16533266.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16533266 = 2 ⋅8266633.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66233561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66233551) 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, 45341 + ... + 46778.

It is an arithmetic number, because the mean of its divisors is an integer number (16581600).

Almost surely, 2^66233561 is an apocalyptic number.

It is an amenable number.

66233561 is a deficient number, since it is larger than the sum of its proper divisors (92839).

66233561 is an equidigital number, since it uses as much as digits as its factorization.

66233561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92838.

The product of its digits is 19440, while the sum is 32.

The square root of 66233561 is about 8138.4003956552. The cubic root of 66233561 is about 404.6001459244.

The spelling of 66233561 in words is "sixty-six million, two hundred thirty-three thousand, five hundred sixty-one".