66291696 has 50 divisors (see below), whose sum is σ = 191871152. Its totient is φ = 22096800.

The previous prime is 66291691. The next prime is 66291713. The reversal of 66291696 is 69619266.

66291696 is a `hidden beast` number, since 6 + 629 + 16 + 9 + 6 = 666.

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

It is a zygodrome in base 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66291691) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 24280 + ... + 26871.

Almost surely, 2^66291696 is an apocalyptic number.

It is an amenable number.

66291696 is an abundant number, since it is smaller than the sum of its proper divisors (125579456).

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

66291696 is a wasteful number, since it uses less digits than its factorization.

66291696 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51171 (or 51156 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 66291696 is about 8141.9712600819. The cubic root of 66291696 is about 404.7184874957.

The spelling of 66291696 in words is "sixty-six million, two hundred ninety-one thousand, six hundred ninety-six".