66696417900 has 1152 divisors, whose sum is σ = 273402501120. Its totient is φ = 13602816000.

The previous prime is 66696417863. The next prime is 66696417929. The reversal of 66696417900 is 971469666.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 383 ways as a sum of consecutive naturals, for example, 803571259 + ... + 803571341.

It is an arithmetic number, because the mean of its divisors is an integer number (237328560).

Almost surely, 2^66696417900 is an apocalyptic number.

66696417900 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 66696417900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136701250560).

66696417900 is an abundant number, since it is smaller than the sum of its proper divisors (206706083220).

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

66696417900 is a wasteful number, since it uses less digits than its factorization.

66696417900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232 (or 219 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The spelling of 66696417900 in words is "sixty-six billion, six hundred ninety-six million, four hundred seventeen thousand, nine hundred".