66226671556 has 6 divisors (see below), whose sum is σ = 115896675230. Its totient is φ = 33113335776.

The previous prime is 66226671509. The next prime is 66226671559. The reversal of 66226671556 is 65517662266.

It can be written as a sum of positive squares in only one way, i.e., 63882562500 + 2344109056 = 252750^2 + 48416^2 .

It is a super-2 number, since 2×66226671556² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (66226671559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8278333941 + ... + 8278333948.

Almost surely, 2^66226671556 is an apocalyptic number.

It is an amenable number.

66226671556 is a deficient number, since it is larger than the sum of its proper divisors (49670003674).

66226671556 is a wasteful number, since it uses less digits than its factorization.

66226671556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16556667893 (or 16556667891 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 52.

The spelling of 66226671556 in words is "sixty-six billion, two hundred twenty-six million, six hundred seventy-one thousand, five hundred fifty-six".