66234168722 has 6 divisors (see below), whose sum is σ = 99351799029. Its totient is φ = 33116902380.

The previous prime is 66234168691. The next prime is 66234168779. The reversal of 66234168722 is 22786143266.

It can be written as a sum of positive squares in 2 ways, for example, as 64825742881 + 1408425841 = 254609^2 + 37529^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=181981.

It is a super-2 number, since 2×66234168722² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 272972 + ... + 454952.

Almost surely, 2^66234168722 is an apocalyptic number.

66234168722 is a deficient number, since it is larger than the sum of its proper divisors (33117630307).

66234168722 is an frugal number, since it uses more digits than its factorization.

66234168722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363964 (or 181983 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 47.

The spelling of 66234168722 in words is "sixty-six billion, two hundred thirty-four million, one hundred sixty-eight thousand, seven hundred twenty-two".