66717681126 has 32 divisors (see below), whose sum is σ = 146156387040. Its totient is φ = 20209276416.

The previous prime is 66717681103. The next prime is 66717681139. The reversal of 66717681126 is 62118671766.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 11274541 + ... + 11280456.

It is an arithmetic number, because the mean of its divisors is an integer number (4567387095).

Almost surely, 2^66717681126 is an apocalyptic number.

66717681126 is an abundant number, since it is smaller than the sum of its proper divisors (79438705914).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66717681126 is a wasteful number, since it uses less digits than its factorization.

66717681126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22555048.

The product of its digits is 1016064, while the sum is 51.

The spelling of 66717681126 in words is "sixty-six billion, seven hundred seventeen million, six hundred eighty-one thousand, one hundred twenty-six".