66543020 has 24 divisors (see below), whose sum is σ = 143518704. Its totient is φ = 25897536.

The previous prime is 66543017. The next prime is 66543031. The reversal of 66543020 is 2034566.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44222 + ... + 45701.

It is an arithmetic number, because the mean of its divisors is an integer number (5979946).

Almost surely, 2^66543020 is an apocalyptic number.

It is an amenable number.

66543020 is an abundant number, since it is smaller than the sum of its proper divisors (76975684).

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

66543020 is a wasteful number, since it uses less digits than its factorization.

66543020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89969 (or 89967 counting only the distinct ones).

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

The square root of 66543020 is about 8157.3905141289. The cubic root of 66543020 is about 405.2292965645.

Adding to 66543020 its reverse (2034566), we get a palindrome (68577586).

The spelling of 66543020 in words is "sixty-six million, five hundred forty-three thousand, twenty".