66157615550123 has 2 divisors, whose sum is σ = 66157615550124. Its totient is φ = 66157615550122.

The previous prime is 66157615550107. The next prime is 66157615550149. The reversal of 66157615550123 is 32105551675166.

66157615550123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66157615550123 - 2⁴ = 66157615550107 is a prime.

It is not a weakly prime, because it can be changed into another prime (66157615550623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33078807775061 + 33078807775062.

It is an arithmetic number, because the mean of its divisors is an integer number (33078807775062).

Almost surely, 2^{66157615550123} is an apocalyptic number.

66157615550123 is a deficient number, since it is larger than the sum of its proper divisors (1).

66157615550123 is an equidigital number, since it uses as much as digits as its factorization.

66157615550123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670000, while the sum is 53.

The spelling of 66157615550123 in words is "sixty-six trillion, one hundred fifty-seven billion, six hundred fifteen million, five hundred fifty thousand, one hundred twenty-three".