66637896 has 64 divisors (see below), whose sum is σ = 180835200. Its totient is φ = 20341248.

The previous prime is 66637891. The next prime is 66637903. The reversal of 66637896 is 69873666.

It is not an unprimeable number, because it can be changed into a prime (66637891) 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, 41965 + ... + 43523.

It is an arithmetic number, because the mean of its divisors is an integer number (2825550).

Almost surely, 2^66637896 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 66637896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90417600).

66637896 is an abundant number, since it is smaller than the sum of its proper divisors (114197304).

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

66637896 is a wasteful number, since it uses less digits than its factorization.

66637896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718 (or 1714 counting only the distinct ones).

The product of its digits is 1959552, while the sum is 51.

The square root of 66637896 is about 8163.2037828294. The cubic root of 66637896 is about 405.4217949766.

The spelling of 66637896 in words is "sixty-six million, six hundred thirty-seven thousand, eight hundred ninety-six".