66630444405 has 32 divisors (see below), whose sum is σ = 128251084800. Its totient is φ = 28856492352.

The previous prime is 66630444379. The next prime is 66630444409. The reversal of 66630444405 is 50444403666.

It is not a de Polignac number, because 66630444405 - 2⁷ = 66630444277 is a prime.

It is a super-2 number, since 2×66630444405² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66630444409) 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 31 ways as a sum of consecutive naturals, for example, 16697365 + ... + 16701354.

It is an arithmetic number, because the mean of its divisors is an integer number (4007846400).

Almost surely, 2^66630444405 is an apocalyptic number.

It is an amenable number.

66630444405 is a deficient number, since it is larger than the sum of its proper divisors (61620640395).

66630444405 is a wasteful number, since it uses less digits than its factorization.

66630444405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33398753.

The product of its (nonzero) digits is 829440, while the sum is 42.

The spelling of 66630444405 in words is "sixty-six billion, six hundred thirty million, four hundred forty-four thousand, four hundred five".