66261233 has 4 divisors (see below), whose sum is σ = 66329088. Its totient is φ = 66193380.

The previous prime is 66261199. The next prime is 66261269. The reversal of 66261233 is 33216266.

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.

It is a cyclic number.

It is not a de Polignac number, because 66261233 - 2⁸ = 66260977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66261196 and 66261205.

It is not an unprimeable number, because it can be changed into a prime (66231233) 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, 32441 + ... + 34422.

It is an arithmetic number, because the mean of its divisors is an integer number (16582272).

Almost surely, 2^66261233 is an apocalyptic number.

It is an amenable number.

66261233 is a deficient number, since it is larger than the sum of its proper divisors (67855).

66261233 is an equidigital number, since it uses as much as digits as its factorization.

66261233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67854.

The product of its digits is 7776, while the sum is 29.

The square root of 66261233 is about 8140.1003065073. The cubic root of 66261233 is about 404.6564846154.

Adding to 66261233 its reverse (33216266), we get a palindrome (99477499).

The spelling of 66261233 in words is "sixty-six million, two hundred sixty-one thousand, two hundred thirty-three".