66623591020 has 24 divisors (see below), whose sum is σ = 159896618784. Its totient is φ = 22842374016.

The previous prime is 66623590973. The next prime is 66623591051. The reversal of 66623591020 is 2019532666.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 237941257 + ... + 237941536.

It is an arithmetic number, because the mean of its divisors is an integer number (6662359116).

Almost surely, 2^66623591020 is an apocalyptic number.

It is an amenable number.

66623591020 is an abundant number, since it is smaller than the sum of its proper divisors (93273027764).

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

66623591020 is a wasteful number, since it uses less digits than its factorization.

66623591020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475882809 (or 475882807 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 40.

The spelling of 66623591020 in words is "sixty-six billion, six hundred twenty-three million, five hundred ninety-one thousand, twenty".