66776514127728 has 40 divisors (see below), whose sum is σ = 172533191895168. Its totient is φ = 22255328743872.

The previous prime is 66776514127727. The next prime is 66776514127751. The reversal of 66776514127728 is 82772141567766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66776514127727) 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, 109357950 + ... + 109966877.

Almost surely, 2^{66776514127728} is an apocalyptic number.

It is an amenable number.

66776514127728 is an abundant number, since it is smaller than the sum of its proper divisors (105756677767440).

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

66776514127728 is a wasteful number, since it uses less digits than its factorization.

66776514127728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219331181 (or 219331175 counting only the distinct ones).

The product of its digits is 331914240, while the sum is 69.

The spelling of 66776514127728 in words is "sixty-six trillion, seven hundred seventy-six billion, five hundred fourteen million, one hundred twenty-seven thousand, seven hundred twenty-eight".