66699736600 has 96 divisors (see below), whose sum is σ = 177798129120. Its totient is φ = 22795269120.

The previous prime is 66699736583. The next prime is 66699736603. The reversal of 66699736600 is 663799666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66699736603) 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, 362094 + ... + 514306.

It is an arithmetic number, because the mean of its divisors is an integer number (1852063845).

Almost surely, 2^66699736600 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66699736600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88899064560).

66699736600 is an abundant number, since it is smaller than the sum of its proper divisors (111098392520).

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

66699736600 is a wasteful number, since it uses less digits than its factorization.

66699736600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152549 (or 152540 counting only the distinct ones).

The product of its (nonzero) digits is 13226976, while the sum is 58.

The spelling of 66699736600 in words is "sixty-six billion, six hundred ninety-nine million, seven hundred thirty-six thousand, six hundred".