66786698088 has 48 divisors (see below), whose sum is σ = 197324337600. Its totient is φ = 20238393120.

The previous prime is 66786698059. The next prime is 66786698089. The reversal of 66786698088 is 88089668766.

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

It is not an unprimeable number, because it can be changed into a prime (66786698089) 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 11 ways as a sum of consecutive naturals, for example, 42162528 + ... + 42164111.

It is an arithmetic number, because the mean of its divisors is an integer number (4110923700).

Almost surely, 2^66786698088 is an apocalyptic number.

It is an amenable number.

66786698088 is an abundant number, since it is smaller than the sum of its proper divisors (130537639512).

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

66786698088 is a wasteful number, since it uses less digits than its factorization.

66786698088 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84326662 (or 84326655 counting only the distinct ones).

The product of its (nonzero) digits is 334430208, while the sum is 72.

The spelling of 66786698088 in words is "sixty-six billion, seven hundred eighty-six million, six hundred ninety-eight thousand, eighty-eight".