66464576920 has 32 divisors (see below), whose sum is σ = 170908912800. Its totient is φ = 22787854848.

The previous prime is 66464576903. The next prime is 66464576921. The reversal of 66464576920 is 2967546466.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66464576921) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 118686465 + ... + 118687024.

It is an arithmetic number, because the mean of its divisors is an integer number (5340903525).

Almost surely, 2^66464576920 is an apocalyptic number.

It is an amenable number.

66464576920 is an abundant number, since it is smaller than the sum of its proper divisors (104444335880).

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

66464576920 is a wasteful number, since it uses less digits than its factorization.

66464576920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237373507 (or 237373503 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 55.

The spelling of 66464576920 in words is "sixty-six billion, four hundred sixty-four million, five hundred seventy-six thousand, nine hundred twenty".