66067636788 has 72 divisors (see below), whose sum is σ = 174024494280. Its totient is φ = 21107896320.

The previous prime is 66067636787. The next prime is 66067636819. The reversal of 66067636788 is 88763676066.

It can be written as a sum of positive squares in 4 ways, for example, as 22712901264 + 43354735524 = 150708^2 + 208218^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66067636783) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 87933 + ... + 373988.

It is an arithmetic number, because the mean of its divisors is an integer number (2417006865).

Almost surely, 2^66067636788 is an apocalyptic number.

It is an amenable number.

66067636788 is an abundant number, since it is smaller than the sum of its proper divisors (107956857492).

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

66067636788 is a wasteful number, since it uses less digits than its factorization.

66067636788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 462097 (or 462092 counting only the distinct ones).

The product of its (nonzero) digits is 73156608, while the sum is 63.

The spelling of 66067636788 in words is "sixty-six billion, sixty-seven million, six hundred thirty-six thousand, seven hundred eighty-eight".