66522870 has 80 divisors (see below), whose sum is σ = 189433728. Its totient is φ = 16692480.

The previous prime is 66522823. The next prime is 66522871. The reversal of 66522870 is 7822566.

66522870 is a `hidden beast` number, since 66 + 522 + 8 + 70 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66522871) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11355 + ... + 16185.

Almost surely, 2^66522870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66522870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94716864).

66522870 is an abundant number, since it is smaller than the sum of its proper divisors (122910858).

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

66522870 is a wasteful number, since it uses less digits than its factorization.

66522870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4867 (or 4858 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 66522870 is about 8156.1553442783. The cubic root of 66522870 is about 405.1883897213.

The spelling of 66522870 in words is "sixty-six million, five hundred twenty-two thousand, eight hundred seventy".