66475633536 has 144 divisors (see below), whose sum is σ = 207137721960. Its totient is φ = 20453981184.

The previous prime is 66475633519. The next prime is 66475633573. The reversal of 66475633536 is 63533657466.

66475633536 is a `hidden beast` number, since 6 + 6 + 4 + 75 + 6 + 33 + 536 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23965 + ... + 365411.

Almost surely, 2^66475633536 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 66475633536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (103568860980).

66475633536 is an abundant number, since it is smaller than the sum of its proper divisors (140662088424).

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

66475633536 is a wasteful number, since it uses less digits than its factorization.

66475633536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341493 (or 341465 counting only the distinct ones).

The product of its digits is 24494400, while the sum is 54.

The spelling of 66475633536 in words is "sixty-six billion, four hundred seventy-five million, six hundred thirty-three thousand, five hundred thirty-six".