66920878080 has 1248 divisors, whose sum is σ = 293668187904. Its totient is φ = 14269022208.

The previous prime is 66920878049. The next prime is 66920878091. The reversal of 66920878080 is 8087802966.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 592220104 + ... + 592220216.

It is an arithmetic number, because the mean of its divisors is an integer number (235311048).

Almost surely, 2^66920878080 is an apocalyptic number.

66920878080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66920878080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146834093952).

66920878080 is an abundant number, since it is smaller than the sum of its proper divisors (226747309824).

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

66920878080 is a wasteful number, since it uses less digits than its factorization.

66920878080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 147 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The spelling of 66920878080 in words is "sixty-six billion, nine hundred twenty million, eight hundred seventy-eight thousand, eighty".