66717667730 has 64 divisors (see below), whose sum is σ = 150009034752. Its totient is φ = 20834565120.

The previous prime is 66717667729. The next prime is 66717667739. The reversal of 66717667730 is 3776671766.

66717667730 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66717667739) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 867389 + ... + 941168.

It is an arithmetic number, because the mean of its divisors is an integer number (2343891168).

Almost surely, 2^66717667730 is an apocalyptic number.

66717667730 is an abundant number, since it is smaller than the sum of its proper divisors (83291367022).

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

66717667730 is a wasteful number, since it uses less digits than its factorization.

66717667730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808619.

The product of its (nonzero) digits is 9335088, while the sum is 56.

The spelling of 66717667730 in words is "sixty-six billion, seven hundred seventeen million, six hundred sixty-seven thousand, seven hundred thirty".