66142170 has 112 divisors (see below), whose sum is σ = 183519072. Its totient is φ = 17146080.

The previous prime is 66142151. The next prime is 66142183. The reversal of 66142170 is 7124166.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 313365 + ... + 313575.

Almost surely, 2^66142170 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66142170, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91759536).

66142170 is an abundant number, since it is smaller than the sum of its proper divisors (117376902).

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

66142170 is a wasteful number, since it uses less digits than its factorization.

66142170 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 66142170 is about 8132.7836562889. The cubic root of 66142170 is about 404.4139672377.

The spelling of 66142170 in words is "sixty-six million, one hundred forty-two thousand, one hundred seventy".