66559299840 has 216 divisors, whose sum is σ = 251224017408. Its totient is φ = 16135557120.

The previous prime is 66559299809. The next prime is 66559299841. The reversal of 66559299840 is 4899295566.

It is not an unprimeable number, because it can be changed into a prime (66559299841) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 135904 + ... + 389343.

Almost surely, 2^66559299840 is an apocalyptic number.

66559299840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66559299840 is an abundant number, since it is smaller than the sum of its proper divisors (184664717568).

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

66559299840 is a wasteful number, since it uses less digits than its factorization.

66559299840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525285 (or 525268 counting only the distinct ones).

The product of its (nonzero) digits is 41990400, while the sum is 63.

The spelling of 66559299840 in words is "sixty-six billion, five hundred fifty-nine million, two hundred ninety-nine thousand, eight hundred forty".