66728385654 has 32 divisors (see below), whose sum is σ = 152550190080. Its totient is φ = 19061732352.

The previous prime is 66728385653. The next prime is 66728385673. The reversal of 66728385654 is 45658382766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66728385653) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 87862 + ... + 375734.

It is an arithmetic number, because the mean of its divisors is an integer number (4767193440).

Almost surely, 2^66728385654 is an apocalyptic number.

66728385654 is an abundant number, since it is smaller than the sum of its proper divisors (85821804426).

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

66728385654 is a wasteful number, since it uses less digits than its factorization.

66728385654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293404.

The product of its digits is 58060800, while the sum is 60.

The spelling of 66728385654 in words is "sixty-six billion, seven hundred twenty-eight million, three hundred eighty-five thousand, six hundred fifty-four".