66669696 has 128 divisors (see below), whose sum is σ = 199756800. Its totient is φ = 21888000.

The previous prime is 66669683. The next prime is 66669719. The reversal of 66669696 is 69696666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

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

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348961 + ... + 349151.

It is an arithmetic number, because the mean of its divisors is an integer number (1560600).

Almost surely, 2^66669696 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 66669696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99878400).

66669696 is an abundant number, since it is smaller than the sum of its proper divisors (133087104).

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

66669696 is a wasteful number, since it uses less digits than its factorization.

66669696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 315 (or 297 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 54.

The square root of 66669696 is about 8165.1513151931. The cubic root of 66669696 is about 405.4862746176.

The spelling of 66669696 in words is "sixty-six million, six hundred sixty-nine thousand, six hundred ninety-six".