66747443656920 has 128 divisors (see below), whose sum is σ = 215667915724800. Its totient is φ = 16428438756864.

The previous prime is 66747443656871. The next prime is 66747443656931. The reversal of 66747443656920 is 2965634474766.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12888949 + ... + 17309531.

It is an arithmetic number, because the mean of its divisors is an integer number (1684905591600).

Almost surely, 2^{66747443656920} is an apocalyptic number.

66747443656920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66747443656920 is an abundant number, since it is smaller than the sum of its proper divisors (148920472067880).

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

66747443656920 is a wasteful number, since it uses less digits than its factorization.

66747443656920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4430289 (or 4430285 counting only the distinct ones).

The product of its (nonzero) digits is 1097349120, while the sum is 69.

The spelling of 66747443656920 in words is "sixty-six trillion, seven hundred forty-seven billion, four hundred forty-three million, six hundred fifty-six thousand, nine hundred twenty".