66331650 has 96 divisors (see below), whose sum is σ = 205129728. Its totient is φ = 13780800.

The previous prime is 66331627. The next prime is 66331663. The reversal of 66331650 is 5613366.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8679 + ... + 14421.

It is an arithmetic number, because the mean of its divisors is an integer number (2136768).

Almost surely, 2^66331650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66331650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102564864).

66331650 is an abundant number, since it is smaller than the sum of its proper divisors (138798078).

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

66331650 is a wasteful number, since it uses less digits than its factorization.

66331650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5776 (or 5771 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 30.

The square root of 66331650 is about 8144.4244732209. The cubic root of 66331650 is about 404.7997791000.

It can be divided in two parts, 663316 and 50, that added together give a palindrome (663366).

The spelling of 66331650 in words is "sixty-six million, three hundred thirty-one thousand, six hundred fifty".