66678656727024 has 120 divisors (see below), whose sum is σ = 189138059984640. Its totient is φ = 21925328870016.

The previous prime is 66678656727017. The next prime is 66678656727029. The reversal of 66678656727024 is 42072765687666.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66678656727029) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10165567 + ... + 15384929.

It is an arithmetic number, because the mean of its divisors is an integer number (1576150499872).

Almost surely, 2^{66678656727024} 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 66678656727024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94569029992320).

66678656727024 is an abundant number, since it is smaller than the sum of its proper divisors (122459403257616).

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

66678656727024 is a wasteful number, since it uses less digits than its factorization.

66678656727024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5220579 (or 5220570 counting only the distinct ones).

The product of its (nonzero) digits is 1706987520, while the sum is 72.

The spelling of 66678656727024 in words is "sixty-six trillion, six hundred seventy-eight billion, six hundred fifty-six million, seven hundred twenty-seven thousand, twenty-four".