66904720064 has 112 divisors (see below), whose sum is σ = 172002297600. Its totient is φ = 25074717696.

The previous prime is 66904720063. The next prime is 66904720111. The reversal of 66904720064 is 46002740966.

It is a tau number, because it is divible by the number of its divisors (112).

It is a junction number, because it is equal to n+sod(n) for n = 66904719997 and 66904720024.

It is not an unprimeable number, because it can be changed into a prime (66904720063) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 191654 + ... + 412965.

It is an arithmetic number, because the mean of its divisors is an integer number (1535734800).

Almost surely, 2^66904720064 is an apocalyptic number.

66904720064 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66904720064 is an abundant number, since it is smaller than the sum of its proper divisors (105097577536).

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

66904720064 is a wasteful number, since it uses less digits than its factorization.

66904720064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604670 (or 604660 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 44.

The spelling of 66904720064 in words is "sixty-six billion, nine hundred four million, seven hundred twenty thousand, sixty-four".