66475969560 has 1728 divisors, whose sum is σ = 315883320480. Its totient is φ = 11914076160.

The previous prime is 66475969543. The next prime is 66475969607. The reversal of 66475969560 is 6596957466.

66475969560 is a `hidden beast` number, since 6 + 6 + 4 + 7 + 5 + 9 + 69 + 560 = 666.

66475969560 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 431 ways as a sum of consecutive naturals, for example, 910629684 + ... + 910629756.

Almost surely, 2^66475969560 is an apocalyptic number.

66475969560 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 66475969560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157941660240).

66475969560 is an abundant number, since it is smaller than the sum of its proper divisors (249407350920).

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

66475969560 is a wasteful number, since it uses less digits than its factorization.

66475969560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 73483200, while the sum is 63.

The spelling of 66475969560 in words is "sixty-six billion, four hundred seventy-five million, nine hundred sixty-nine thousand, five hundred sixty".