66426500 has 48 divisors (see below), whose sum is σ = 165809280. Its totient is φ = 22773600.

The previous prime is 66426491. The next prime is 66426551. The reversal of 66426500 is 562466.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5990 + ... + 12989.

It is an arithmetic number, because the mean of its divisors is an integer number (3454360).

Almost surely, 2^66426500 is an apocalyptic number.

It is an amenable number.

66426500 is an abundant number, since it is smaller than the sum of its proper divisors (99382780).

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

66426500 is a wasteful number, since it uses less digits than its factorization.

66426500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19005 (or 18993 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 66426500 is about 8150.2453950786. The cubic root of 66426500 is about 404.9926331028.

Adding to 66426500 its reverse (562466), we get a palindrome (66988966).

The spelling of 66426500 in words is "sixty-six million, four hundred twenty-six thousand, five hundred".