66432500 has 30 divisors (see below), whose sum is σ = 145280058. Its totient is φ = 26572000.

The previous prime is 66432469. The next prime is 66432511. The reversal of 66432500 is 523466.

It can be written as a sum of positive squares in 5 ways, for example, as 5654884 + 60777616 = 2378^2 + 7796^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66432500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 10787 + ... + 15786.

Almost surely, 2^66432500 is an apocalyptic number.

It is an amenable number.

66432500 is an abundant number, since it is smaller than the sum of its proper divisors (78847558).

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

66432500 is a wasteful number, since it uses less digits than its factorization.

66432500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26597 (or 26580 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

The square root of 66432500 is about 8150.6134738435. The cubic root of 66432500 is about 405.0048264425.

Adding to 66432500 its reverse (523466), we get a palindrome (66955966).

The spelling of 66432500 in words is "sixty-six million, four hundred thirty-two thousand, five hundred".