66211623533 has 8 divisors (see below), whose sum is σ = 72235549920. Its totient is φ = 60188478480.

The previous prime is 66211623479. The next prime is 66211623559. The reversal of 66211623533 is 33532611266.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66211623533 - 2¹² = 66211619437 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 (66211623593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10535 + ... + 364052.

It is an arithmetic number, because the mean of its divisors is an integer number (9029443740).

Almost surely, 2^66211623533 is an apocalyptic number.

It is an amenable number.

66211623533 is a deficient number, since it is larger than the sum of its proper divisors (6023926387).

66211623533 is a wasteful number, since it uses less digits than its factorization.

66211623533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 390667.

The product of its digits is 116640, while the sum is 38.

The spelling of 66211623533 in words is "sixty-six billion, two hundred eleven million, six hundred twenty-three thousand, five hundred thirty-three".