66699108 has 72 divisors (see below), whose sum is σ = 195890240. Its totient is φ = 18740160.

The previous prime is 66699091. The next prime is 66699119. The reversal of 66699108 is 80199666.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13203 + ... + 17541.

Almost surely, 2^66699108 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66699108, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97945120).

66699108 is an abundant number, since it is smaller than the sum of its proper divisors (129191132).

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

66699108 is a wasteful number, since it uses less digits than its factorization.

66699108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4417 (or 4412 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 66699108 is about 8166.9521854851. The cubic root of 66699108 is about 405.5458939533.

The spelling of 66699108 in words is "sixty-six million, six hundred ninety-nine thousand, one hundred eight".