66061996 has 72 divisors (see below), whose sum is σ = 158061456. Its totient is φ = 23748480.

The previous prime is 66061987. The next prime is 66061999. The reversal of 66061996 is 69916066.

It is not an unprimeable number, because it can be changed into a prime (66061999) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26850 + ... + 29206.

It is an arithmetic number, because the mean of its divisors is an integer number (2195298).

Almost surely, 2^66061996 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 66061996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79030728).

66061996 is an abundant number, since it is smaller than the sum of its proper divisors (91999460).

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

66061996 is a wasteful number, since it uses less digits than its factorization.

66061996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2399 (or 2390 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 66061996 is about 8127.8530990662. The cubic root of 66061996 is about 404.2504981785.

The spelling of 66061996 in words is "sixty-six million, sixty-one thousand, nine hundred ninety-six".