66750533 has 4 divisors (see below), whose sum is σ = 68903808. Its totient is φ = 64597260.

The previous prime is 66750529. The next prime is 66750557. The reversal of 66750533 is 33505766.

66750533 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66750533 - 2² = 66750529 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 66750493 and 66750502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66750833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1076591 + ... + 1076652.

It is an arithmetic number, because the mean of its divisors is an integer number (17225952).

Almost surely, 2^66750533 is an apocalyptic number.

It is an amenable number.

66750533 is a deficient number, since it is larger than the sum of its proper divisors (2153275).

66750533 is a wasteful number, since it uses less digits than its factorization.

66750533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153274.

The product of its (nonzero) digits is 56700, while the sum is 35.

The square root of 66750533 is about 8170.0999381893. The cubic root of 66750533 is about 405.6500924488.

The spelling of 66750533 in words is "sixty-six million, seven hundred fifty thousand, five hundred thirty-three".