66142530 has 96 divisors (see below), whose sum is σ = 179831808. Its totient is φ = 16848000.

The previous prime is 66142523. The next prime is 66142541. The reversal of 66142530 is 3524166.

It is a junction number, because it is equal to n+sod(n) for n = 66142494 and 66142503.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 421212 + ... + 421368.

It is an arithmetic number, because the mean of its divisors is an integer number (1873248).

Almost surely, 2^66142530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66142530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89915904).

66142530 is an abundant number, since it is smaller than the sum of its proper divisors (113689278).

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

66142530 is a wasteful number, since it uses less digits than its factorization.

66142530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 352 (or 349 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 66142530 is about 8132.8057889021. The cubic root of 66142530 is about 404.4147009540.

Adding to 66142530 its reverse (3524166), we get a palindrome (69666696).

The spelling of 66142530 in words is "sixty-six million, one hundred forty-two thousand, five hundred thirty".