66731033 has 4 divisors (see below), whose sum is σ = 66747408. Its totient is φ = 66714660.

The previous prime is 66731009. The next prime is 66731039. The reversal of 66731033 is 33013766.

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 a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 66731033 - 2²⁴ = 49953817 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66730987 and 66731005.

It is not an unprimeable number, because it can be changed into a prime (66731039) 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, 3278 + ... + 12008.

It is an arithmetic number, because the mean of its divisors is an integer number (16686852).

Almost surely, 2^66731033 is an apocalyptic number.

It is an amenable number.

66731033 is a deficient number, since it is larger than the sum of its proper divisors (16375).

66731033 is an equidigital number, since it uses as much as digits as its factorization.

66731033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16374.

The product of its (nonzero) digits is 6804, while the sum is 29.

The square root of 66731033 is about 8168.9064751654. The cubic root of 66731033 is about 405.6105874099.

Adding to 66731033 its reverse (33013766), we get a palindrome (99744799).

The spelling of 66731033 in words is "sixty-six million, seven hundred thirty-one thousand, thirty-three".