66885956109 has 12 divisors (see below), whose sum is σ = 110414911776. Its totient is φ = 38220546312.

The previous prime is 66885956099. The next prime is 66885956143. The reversal of 66885956109 is 90165958866.

66885956109 is a `hidden beast` number, since 6 + 6 + 8 + 8 + 5 + 9 + 5 + 610 + 9 = 666.

It is not a de Polignac number, because 66885956109 - 2⁵ = 66885956077 is a prime.

It is a super-2 number, since 2×66885956109² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 1061681843 = 66885956109 / (6 + 6 + 8 + 8 + 5 + 9 + 5 + 6 + 1 + 0 + 9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66885956209) 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 11 ways as a sum of consecutive naturals, for example, 530840859 + ... + 530840984.

It is an arithmetic number, because the mean of its divisors is an integer number (9201242648).

Almost surely, 2^66885956109 is an apocalyptic number.

It is an amenable number.

66885956109 is a deficient number, since it is larger than the sum of its proper divisors (43528955667).

66885956109 is a wasteful number, since it uses less digits than its factorization.

66885956109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1061681856 (or 1061681853 counting only the distinct ones).

The product of its (nonzero) digits is 27993600, while the sum is 63.

The spelling of 66885956109 in words is "sixty-six billion, eight hundred eighty-five million, nine hundred fifty-six thousand, one hundred nine".