66117707730 has 64 divisors (see below), whose sum is σ = 180414241920. Its totient is φ = 17221353408.

The previous prime is 66117707729. The next prime is 66117707731. The reversal of 66117707730 is 3770771166.

It is an interprime number because it is at equal distance from previous prime (66117707729) and next prime (66117707731).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66117707731) 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, 2835837 + ... + 2859056.

It is an arithmetic number, because the mean of its divisors is an integer number (2818972530).

Almost surely, 2^66117707730 is an apocalyptic number.

66117707730 is an abundant number, since it is smaller than the sum of its proper divisors (114296534190).

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

66117707730 is a wasteful number, since it uses less digits than its factorization.

66117707730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5694952 (or 5694946 counting only the distinct ones).

The product of its (nonzero) digits is 259308, while the sum is 45.

The spelling of 66117707730 in words is "sixty-six billion, one hundred seventeen million, seven hundred seven thousand, seven hundred thirty".