66708464520 has 512 divisors, whose sum is σ = 221298739200. Its totient is φ = 16046284800.

The previous prime is 66708464509. The next prime is 66708464531. The reversal of 66708464520 is 2546480766.

It is an interprime number because it is at equal distance from previous prime (66708464509) and next prime (66708464531).

It is a self number, because there is not a number n which added to its sum of digits gives 66708464520.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 509224855 + ... + 509224985.

It is an arithmetic number, because the mean of its divisors is an integer number (432224100).

Almost surely, 2^66708464520 is an apocalyptic number.

66708464520 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 66708464520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110649369600).

66708464520 is an abundant number, since it is smaller than the sum of its proper divisors (154590274680).

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

66708464520 is a wasteful number, since it uses less digits than its factorization.

66708464520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 1935360, while the sum is 48.

The spelling of 66708464520 in words is "sixty-six billion, seven hundred eight million, four hundred sixty-four thousand, five hundred twenty".