66854686220 has 24 divisors (see below), whose sum is σ = 160451247264. Its totient is φ = 22921606656.

The previous prime is 66854686219. The next prime is 66854686237. The reversal of 66854686220 is 2268645866.

It is a super-3 number, since 3×66854686220³ (a number of 33 digits) contains 333 as substring.

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 7 ways as a sum of consecutive naturals, for example, 238766597 + ... + 238766876.

It is an arithmetic number, because the mean of its divisors is an integer number (6685468636).

Almost surely, 2^66854686220 is an apocalyptic number.

It is an amenable number.

66854686220 is an abundant number, since it is smaller than the sum of its proper divisors (93596561044).

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

66854686220 is a wasteful number, since it uses less digits than its factorization.

66854686220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477533489 (or 477533487 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 53.

The spelling of 66854686220 in words is "sixty-six billion, eight hundred fifty-four million, six hundred eighty-six thousand, two hundred twenty".