66166470 has 96 divisors (see below), whose sum is σ = 181333152. Its totient is φ = 17356032.

The previous prime is 66166447. The next prime is 66166483. The reversal of 66166470 is 7466166.

66166470 = 323² + 324² + ... + 614².

66166470 is a `hidden beast` number, since 6 + 6 + 1 + 6 + 647 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 177204 + ... + 177576.

It is an arithmetic number, because the mean of its divisors is an integer number (1888887).

Almost surely, 2^66166470 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66166470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90666576).

66166470 is an abundant number, since it is smaller than the sum of its proper divisors (115166682).

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

66166470 is a wasteful number, since it uses less digits than its factorization.

66166470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 468 (or 456 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 66166470 is about 8134.2774725233. The cubic root of 66166470 is about 404.4634871136.

The spelling of 66166470 in words is "sixty-six million, one hundred sixty-six thousand, four hundred seventy".