66142650 has 72 divisors (see below), whose sum is σ = 190836000. Its totient is φ = 15116640.

The previous prime is 66142621. The next prime is 66142697. The reversal of 66142650 is 5624166.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2851 + ... + 11849.

It is an arithmetic number, because the mean of its divisors is an integer number (2650500).

Almost surely, 2^66142650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66142650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95418000).

66142650 is an abundant number, since it is smaller than the sum of its proper divisors (124693350).

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

66142650 is a wasteful number, since it uses less digits than its factorization.

66142650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9028 (or 9016 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 66142650 is about 8132.8131664265. The cubic root of 66142650 is about 404.4149455255.

The spelling of 66142650 in words is "sixty-six million, one hundred forty-two thousand, six hundred fifty".