66640464137127 has 8 divisors (see below), whose sum is σ = 88854138507760. Its totient is φ = 44426882928960.

The previous prime is 66640464137123. The next prime is 66640464137141. The reversal of 66640464137127 is 72173146404666.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 66640464137127 - 2² = 66640464137123 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66640464137123) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21604102 + ... + 24495267.

It is an arithmetic number, because the mean of its divisors is an integer number (11106767313470).

Almost surely, 2^{66640464137127} is an apocalyptic number.

66640464137127 is a deficient number, since it is larger than the sum of its proper divisors (22213674370633).

66640464137127 is a wasteful number, since it uses less digits than its factorization.

66640464137127 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46581233.

The product of its (nonzero) digits is 24385536, while the sum is 57.

The spelling of 66640464137127 in words is "sixty-six trillion, six hundred forty billion, four hundred sixty-four million, one hundred thirty-seven thousand, one hundred twenty-seven".