66550534621 has 8 divisors (see below), whose sum is σ = 66736088064. Its totient is φ = 66365043360.

The previous prime is 66550534613. The next prime is 66550534643. The reversal of 66550534621 is 12643505566.

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 66550534621 - 2³ = 66550534613 is a prime.

It is a super-2 number, since 2×66550534621² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66550537621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2853610 + ... + 2876836.

It is an arithmetic number, because the mean of its divisors is an integer number (8342011008).

Almost surely, 2^66550534621 is an apocalyptic number.

It is an amenable number.

66550534621 is a deficient number, since it is larger than the sum of its proper divisors (185553443).

66550534621 is a wasteful number, since it uses less digits than its factorization.

66550534621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31091.

The product of its (nonzero) digits is 648000, while the sum is 43.

The spelling of 66550534621 in words is "sixty-six billion, five hundred fifty million, five hundred thirty-four thousand, six hundred twenty-one".