66779287080 has 128 divisors (see below), whose sum is σ = 230053132800. Its totient is φ = 15336864000.

The previous prime is 66779287067. The next prime is 66779287121. The reversal of 66779287080 is 8078297766.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1306246 + ... + 1356405.

It is an arithmetic number, because the mean of its divisors is an integer number (1797290100).

Almost surely, 2^66779287080 is an apocalyptic number.

66779287080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66779287080 is an abundant number, since it is smaller than the sum of its proper divisors (163273845720).

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

66779287080 is a wasteful number, since it uses less digits than its factorization.

66779287080 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2662695 (or 2662691 counting only the distinct ones).

The product of its (nonzero) digits is 14224896, while the sum is 60.

The spelling of 66779287080 in words is "sixty-six billion, seven hundred seventy-nine million, two hundred eighty-seven thousand, eighty".