66780011008 has 40 divisors (see below), whose sum is σ = 133988120640. Its totient is φ = 33250237440.

The previous prime is 66780010991. The next prime is 66780011009. The reversal of 66780011008 is 80011008766.

It is a super-3 number, since 3×66780011008³ (a number of 33 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (66780011009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 150498 + ... + 395233.

It is an arithmetic number, because the mean of its divisors is an integer number (3349703016).

Almost surely, 2^66780011008 is an apocalyptic number.

It is an amenable number.

66780011008 is an abundant number, since it is smaller than the sum of its proper divisors (67208109632).

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

66780011008 is an equidigital number, since it uses as much as digits as its factorization.

66780011008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545988 (or 545972 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 37.

The spelling of 66780011008 in words is "sixty-six billion, seven hundred eighty million, eleven thousand, eight".