66563020 has 24 divisors (see below), whose sum is σ = 140309568. Its totient is φ = 26524800.

The previous prime is 66563009. The next prime is 66563053. The reversal of 66563020 is 2036566.

It is a self number, because there is not a number n which added to its sum of digits gives 66563020.

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, 721 + ... + 11560.

It is an arithmetic number, because the mean of its divisors is an integer number (5846232).

Almost surely, 2^66563020 is an apocalyptic number.

It is an amenable number.

66563020 is an abundant number, since it is smaller than the sum of its proper divisors (73746548).

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

66563020 is a wasteful number, since it uses less digits than its factorization.

66563020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12561 (or 12559 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 66563020 is about 8158.6163042516. The cubic root of 66563020 is about 405.2698907250.

Adding to 66563020 its reverse (2036566), we get a palindrome (68599586).

The spelling of 66563020 in words is "sixty-six million, five hundred sixty-three thousand, twenty".