66785425632 has 72 divisors (see below), whose sum is σ = 191287507320. Its totient is φ = 22101638400.

The previous prime is 66785425631. The next prime is 66785425687. The reversal of 66785425632 is 23652458766.

66785425632 is a `hidden beast` number, since 6 + 6 + 78 + 5 + 4 + 2 + 563 + 2 = 666.

66785425632 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66785425631) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 794119 + ... + 874182.

It is an arithmetic number, because the mean of its divisors is an integer number (2656770935).

Almost surely, 2^66785425632 is an apocalyptic number.

It is an amenable number.

66785425632 is an abundant number, since it is smaller than the sum of its proper divisors (124502081688).

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

66785425632 is a wasteful number, since it uses less digits than its factorization.

66785425632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668456 (or 1668445 counting only the distinct ones).

The product of its digits is 14515200, while the sum is 54.

The spelling of 66785425632 in words is "sixty-six billion, seven hundred eighty-five million, four hundred twenty-five thousand, six hundred thirty-two".