66375351504 has 800 divisors, whose sum is σ = 253046661120. Its totient is φ = 16421771520.

The previous prime is 66375351473. The next prime is 66375351557. The reversal of 66375351504 is 40515357366.

66375351504 is a `hidden beast` number, since 6 + 63 + 7 + 535 + 1 + 50 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 66375351504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 277721017 + ... + 277721255.

Almost surely, 2^66375351504 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 66375351504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126523330560).

66375351504 is an abundant number, since it is smaller than the sum of its proper divisors (186671309616).

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

66375351504 is a wasteful number, since it uses less digits than its factorization.

66375351504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 285 counting only the distinct ones).

The product of its (nonzero) digits is 1134000, while the sum is 45.

The spelling of 66375351504 in words is "sixty-six billion, three hundred seventy-five million, three hundred fifty-one thousand, five hundred four".