66885895691 has 8 divisors (see below), whose sum is σ = 68693022000. Its totient is φ = 65101218400.

The previous prime is 66885895649. The next prime is 66885895733. The reversal of 66885895691 is 19659858866.

It is an interprime number because it is at equal distance from previous prime (66885895649) and next prime (66885895733).

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 66885895691 - 2¹⁰ = 66885894667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66885895621) 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, 5606216 + ... + 5618133.

It is an arithmetic number, because the mean of its divisors is an integer number (8586627750).

Almost surely, 2^66885895691 is an apocalyptic number.

66885895691 is a deficient number, since it is larger than the sum of its proper divisors (1807126309).

66885895691 is a wasteful number, since it uses less digits than its factorization.

66885895691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11224509.

The product of its digits is 223948800, while the sum is 71.

The spelling of 66885895691 in words is "sixty-six billion, eight hundred eighty-five million, eight hundred ninety-five thousand, six hundred ninety-one".