66653417376 has 960 divisors, whose sum is σ = 252717696000. Its totient is φ = 17118646272.

The previous prime is 66653417351. The next prime is 66653417393. The reversal of 66653417376 is 67371435666.

It is a happy number.

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 159 ways as a sum of consecutive naturals, for example, 843714105 + ... + 843714183.

It is an arithmetic number, because the mean of its divisors is an integer number (263247600).

Almost surely, 2^66653417376 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 66653417376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126358848000).

66653417376 is an abundant number, since it is smaller than the sum of its proper divisors (186064278624).

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

66653417376 is a wasteful number, since it uses less digits than its factorization.

66653417376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 177 counting only the distinct ones).

The product of its digits is 11430720, while the sum is 54.

The spelling of 66653417376 in words is "sixty-six billion, six hundred fifty-three million, four hundred seventeen thousand, three hundred seventy-six".