66927656140 has 24 divisors (see below), whose sum is σ = 141082492320. Its totient is φ = 26669269248.

The previous prime is 66927656087. The next prime is 66927656153. The reversal of 66927656140 is 4165672966.

It is a happy number.

It is a super-2 number, since 2×66927656140² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6356685 + ... + 6367204.

It is an arithmetic number, because the mean of its divisors is an integer number (5878437180).

Almost surely, 2^66927656140 is an apocalyptic number.

It is an amenable number.

66927656140 is an abundant number, since it is smaller than the sum of its proper divisors (74154836180).

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

66927656140 is a wasteful number, since it uses less digits than its factorization.

66927656140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12724161 (or 12724159 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 52.

The spelling of 66927656140 in words is "sixty-six billion, nine hundred twenty-seven million, six hundred fifty-six thousand, one hundred forty".