66564750 has 128 divisors (see below), whose sum is σ = 196485120. Its totient is φ = 14688000.

The previous prime is 66564749. The next prime is 66564761. The reversal of 66564750 is 5746566.

It is a junction number, because it is equal to n+sod(n) for n = 66564699 and 66564708.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 162546 + ... + 162954.

It is an arithmetic number, because the mean of its divisors is an integer number (1535040).

Almost surely, 2^66564750 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66564750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (98242560).

66564750 is an abundant number, since it is smaller than the sum of its proper divisors (129920370).

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

66564750 is a wasteful number, since it uses less digits than its factorization.

66564750 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 467 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 39.

The square root of 66564750 is about 8158.7223264430. The cubic root of 66564750 is about 405.2734017378.

The spelling of 66564750 in words is "sixty-six million, five hundred sixty-four thousand, seven hundred fifty".