55616666729 has 4 divisors (see below), whose sum is σ = 59894871876. Its totient is φ = 51338461584.

The previous prime is 55616666719. The next prime is 55616666801. The reversal of 55616666729 is 92766661655.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92766661655 = 5 ⋅18553332331.

It can be written as a sum of positive squares in 2 ways, for example, as 16319551504 + 39297115225 = 127748^2 + 198235^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55616666729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55616666719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2139102554 + ... + 2139102579.

It is an arithmetic number, because the mean of its divisors is an integer number (14973717969).

Almost surely, 2^55616666729 is an apocalyptic number.

It is an amenable number.

55616666729 is a deficient number, since it is larger than the sum of its proper divisors (4278205147).

55616666729 is a wasteful number, since it uses less digits than its factorization.

55616666729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4278205146.

The product of its digits is 24494400, while the sum is 59.

The spelling of 55616666729 in words is "fifty-five billion, six hundred sixteen million, six hundred sixty-six thousand, seven hundred twenty-nine".