61116666729 has 8 divisors (see below), whose sum is σ = 81490180992. Its totient is φ = 40743798480.

The previous prime is 61116666719. The next prime is 61116666757. The reversal of 61116666729 is 92766661116.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61116666729 - 2¹¹ = 61116664681 is a prime.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (61116666719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 139264 + ... + 376334.

It is an arithmetic number, because the mean of its divisors is an integer number (10186272624).

Almost surely, 2^61116666729 is an apocalyptic number.

It is an amenable number.

61116666729 is a deficient number, since it is larger than the sum of its proper divisors (20373514263).

61116666729 is a wasteful number, since it uses less digits than its factorization.

61116666729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323007.

The product of its digits is 979776, while the sum is 51.

The spelling of 61116666729 in words is "sixty-one billion, one hundred sixteen million, six hundred sixty-six thousand, seven hundred twenty-nine".