66650526 has 48 divisors (see below), whose sum is σ = 154954800. Its totient is φ = 21446208.

The previous prime is 66650513. The next prime is 66650593. The reversal of 66650526 is 62505666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11730 + ... + 16458.

It is an arithmetic number, because the mean of its divisors is an integer number (3228225).

Almost surely, 2^66650526 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66650526, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77477400).

66650526 is an abundant number, since it is smaller than the sum of its proper divisors (88304274).

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

66650526 is a wasteful number, since it uses less digits than its factorization.

66650526 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4775 (or 4763 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 66650526 is about 8163.9773395080. The cubic root of 66650526 is about 405.4474067986.

It can be divided in two parts, 66650 and 526, that added together give a palindrome (67176).

The spelling of 66650526 in words is "sixty-six million, six hundred fifty thousand, five hundred twenty-six".