66631116 has 12 divisors (see below), whose sum is σ = 155472632. Its totient is φ = 22210368.

The previous prime is 66631099. The next prime is 66631133. The reversal of 66631116 is 61113666.

It is an interprime number because it is at equal distance from previous prime (66631099) and next prime (66631133).

It is a tau number, because it is divible by the number of its divisors (12).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2776285 + ... + 2776308.

Almost surely, 2^66631116 is an apocalyptic number.

It is an amenable number.

66631116 is an abundant number, since it is smaller than the sum of its proper divisors (88841516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66631116 is a wasteful number, since it uses less digits than its factorization.

66631116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5552600 (or 5552598 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 66631116 is about 8162.7884941361. The cubic root of 66631116 is about 405.4080447775.

The spelling of 66631116 in words is "sixty-six million, six hundred thirty-one thousand, one hundred sixteen".