66613712 has 40 divisors (see below), whose sum is σ = 141365952. Its totient is φ = 30156800.

The previous prime is 66613709. The next prime is 66613717. The reversal of 66613712 is 21731666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66613717) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54128 + ... + 55344.

Almost surely, 2^66613712 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 66613712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70682976).

66613712 is an abundant number, since it is smaller than the sum of its proper divisors (74752240).

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

66613712 is a wasteful number, since it uses less digits than its factorization.

66613712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1547 (or 1541 counting only the distinct ones).

The product of its digits is 9072, while the sum is 32.

The square root of 66613712 is about 8161.7223672458. The cubic root of 66613712 is about 405.3727442731.

The spelling of 66613712 in words is "sixty-six million, six hundred thirteen thousand, seven hundred twelve".