66123371061 has 24 divisors (see below), whose sum is σ = 107675650880. Its totient is φ = 40074768360.

The previous prime is 66123371059. The next prime is 66123371081. The reversal of 66123371061 is 16017332166.

66123371061 is a `hidden beast` number, since 6 + 612 + 3 + 37 + 1 + 0 + 6 + 1 = 666.

It is not a de Polignac number, because 66123371061 - 2¹ = 66123371059 is a prime.

It is a super-3 number, since 3×66123371061³ (a number of 33 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66123371011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10116625 + ... + 10123158.

Almost surely, 2^66123371061 is an apocalyptic number.

It is an amenable number.

66123371061 is a deficient number, since it is larger than the sum of its proper divisors (41552279819).

66123371061 is a wasteful number, since it uses less digits than its factorization.

66123371061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20239814 (or 20239797 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The spelling of 66123371061 in words is "sixty-six billion, one hundred twenty-three million, three hundred seventy-one thousand, sixty-one".