66124133 has 4 divisors (see below), whose sum is σ = 66143628. Its totient is φ = 66104640.

The previous prime is 66124127. The next prime is 66124139. The reversal of 66124133 is 33142166.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33142166 = 2 ⋅16571083.

It is an interprime number because it is at equal distance from previous prime (66124127) and next prime (66124139).

It can be written as a sum of positive squares in 2 ways, for example, as 25381444 + 40742689 = 5038^2 + 6383^2 .

It is a cyclic number.

It is not a de Polignac number, because 66124133 - 2¹⁸ = 65861989 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 (66124139) 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, 3188 + ... + 11933.

It is an arithmetic number, because the mean of its divisors is an integer number (16535907).

Almost surely, 2^66124133 is an apocalyptic number.

It is an amenable number.

66124133 is a deficient number, since it is larger than the sum of its proper divisors (19495).

66124133 is a wasteful number, since it uses less digits than its factorization.

66124133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19494.

The product of its digits is 2592, while the sum is 26.

The square root of 66124133 is about 8131.6746737680. The cubic root of 66124133 is about 404.3772026043.

Adding to 66124133 its reverse (33142166), we get a palindrome (99266299).

The spelling of 66124133 in words is "sixty-six million, one hundred twenty-four thousand, one hundred thirty-three".