66551255576 has 32 divisors (see below), whose sum is σ = 138717264000. Its totient is φ = 29725125120.

The previous prime is 66551255543. The next prime is 66551255581. The reversal of 66551255576 is 67555215566.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10318001 + ... + 10324448.

It is an arithmetic number, because the mean of its divisors is an integer number (4334914500).

Almost surely, 2^66551255576 is an apocalyptic number.

It is an amenable number.

66551255576 is an abundant number, since it is smaller than the sum of its proper divisors (72166008424).

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

66551255576 is a wasteful number, since it uses less digits than its factorization.

66551255576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20642499 (or 20642495 counting only the distinct ones).

The product of its digits is 9450000, while the sum is 53.

The spelling of 66551255576 in words is "sixty-six billion, five hundred fifty-one million, two hundred fifty-five thousand, five hundred seventy-six".