66700881 has 16 divisors (see below), whose sum is σ = 106417920. Its totient is φ = 41046480.

The previous prime is 66700873. The next prime is 66700883. The reversal of 66700881 is 18800766.

It is not a de Polignac number, because 66700881 - 2³ = 66700873 is a prime.

It is a super-2 number, since 2×66700881² = 8898015052352322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66700883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94665 + ... + 95366.

It is an arithmetic number, because the mean of its divisors is an integer number (6651120).

Almost surely, 2^66700881 is an apocalyptic number.

It is an amenable number.

66700881 is a deficient number, since it is larger than the sum of its proper divisors (39717039).

66700881 is a wasteful number, since it uses less digits than its factorization.

66700881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190053 (or 190047 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 66700881 is about 8167.0607319892. The cubic root of 66700881 is about 405.5494873372.

The spelling of 66700881 in words is "sixty-six million, seven hundred thousand, eight hundred eighty-one".