66116156660650 has 12 divisors (see below), whose sum is σ = 122976051388902. Its totient is φ = 26446462664240.

The previous prime is 66116156660641. The next prime is 66116156660651. The reversal of 66116156660650 is 5606665161166.

It can be written as a sum of positive squares in 3 ways, for example, as 62657847380241 + 3458309280409 = 7915671^2 + 1859653^2 .

It is a super-2 number, since 2×66116156660650² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 66116156660591 and 66116156660600.

It is not an unprimeable number, because it can be changed into a prime (66116156660651) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 661161566557 + ... + 661161566656.

Almost surely, 2^{66116156660650} is an apocalyptic number.

66116156660650 is a deficient number, since it is larger than the sum of its proper divisors (56859894728252).

66116156660650 is a wasteful number, since it uses less digits than its factorization.

66116156660650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322323133225 (or 1322323133220 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 55.

The spelling of 66116156660650 in words is "sixty-six trillion, one hundred sixteen billion, one hundred fifty-six million, six hundred sixty thousand, six hundred fifty".