66746887488 has 70 divisors (see below), whose sum is σ = 197858699786. Its totient is φ = 22248960768.

The previous prime is 66746887469. The next prime is 66746887489. The reversal of 66746887488 is 88478864766.

66746887488 is a `hidden beast` number, since 6 + 6 + 7 + 4 + 68 + 87 + 488 = 666.

It can be written as a sum of positive squares in only one way, i.e., 65921589504 + 825297984 = 256752^2 + 28728^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66746887489) 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 9 ways as a sum of consecutive naturals, for example, 6432595 + ... + 6442962.

Almost surely, 2^66746887488 is an apocalyptic number.

It is an amenable number.

66746887488 is an abundant number, since it is smaller than the sum of its proper divisors (131111812298).

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

66746887488 is a wasteful number, since it uses less digits than its factorization.

66746887488 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12875581 (or 12875562 counting only the distinct ones).

The product of its digits is 693633024, while the sum is 72.

The spelling of 66746887488 in words is "sixty-six billion, seven hundred forty-six million, eight hundred eighty-seven thousand, four hundred eighty-eight".