66205650 has 96 divisors (see below), whose sum is σ = 198737280. Its totient is φ = 14238720.

The previous prime is 66205631. The next prime is 66205651. The reversal of 66205650 is 5650266.

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

It is not an unprimeable number, because it can be changed into a prime (66205651) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15996 + ... + 19704.

It is an arithmetic number, because the mean of its divisors is an integer number (2070180).

Almost surely, 2^66205650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66205650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99368640).

66205650 is an abundant number, since it is smaller than the sum of its proper divisors (132531630).

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

66205650 is a wasteful number, since it uses less digits than its factorization.

66205650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3748 (or 3743 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The square root of 66205650 is about 8136.6854431027. The cubic root of 66205650 is about 404.5433047443.

The spelling of 66205650 in words is "sixty-six million, two hundred five thousand, six hundred fifty".