66021450 has 48 divisors (see below), whose sum is σ = 178622496. Its totient is φ = 16004800.

The previous prime is 66021427. The next prime is 66021451. The reversal of 66021450 is 5412066.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66021450.

It is not an unprimeable number, because it can be changed into a prime (66021451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18357 + ... + 21656.

It is an arithmetic number, because the mean of its divisors is an integer number (3721302).

Almost surely, 2^66021450 is an apocalyptic number.

66021450 is an abundant number, since it is smaller than the sum of its proper divisors (112601046).

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

66021450 is a wasteful number, since it uses less digits than its factorization.

66021450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40039 (or 40034 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 66021450 is about 8125.3584536314. The cubic root of 66021450 is about 404.1677774205.

The spelling of 66021450 in words is "sixty-six million, twenty-one thousand, four hundred fifty".