66113500 has 48 divisors (see below), whose sum is σ = 150696000. Its totient is φ = 25291200.

The previous prime is 66113497. The next prime is 66113503. The reversal of 66113500 is 531166.

It is an interprime number because it is at equal distance from previous prime (66113497) and next prime (66113503).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66113503) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 8626 + ... + 14374.

It is an arithmetic number, because the mean of its divisors is an integer number (3139500).

Almost surely, 2^66113500 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66113500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75348000).

66113500 is an abundant number, since it is smaller than the sum of its proper divisors (84582500).

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

66113500 is a wasteful number, since it uses less digits than its factorization.

66113500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5791 (or 5779 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 22.

The square root of 66113500 is about 8131.0208461177. The cubic root of 66113500 is about 404.3555263363.

Adding to 66113500 its reverse (531166), we get a palindrome (66644666).

It can be divided in two parts, 661 and 13500, that added together give a square (14161 = 119²).

The spelling of 66113500 in words is "sixty-six million, one hundred thirteen thousand, five hundred".