66071616 has 112 divisors (see below), whose sum is σ = 190829184. Its totient is φ = 20054016.

The previous prime is 66071611. The next prime is 66071651. The reversal of 66071616 is 61617066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66071611) 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, 256960 + ... + 257216.

It is an arithmetic number, because the mean of its divisors is an integer number (1703832).

Almost surely, 2^66071616 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 66071616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95414592).

66071616 is an abundant number, since it is smaller than the sum of its proper divisors (124757568).

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

66071616 is a wasteful number, since it uses less digits than its factorization.

66071616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 66071616 is about 8128.4448697152. Note that the first 3 decimals coincide. The cubic root of 66071616 is about 404.2701196516.

The spelling of 66071616 in words is "sixty-six million, seventy-one thousand, six hundred sixteen".