66552789240 has 256 divisors, whose sum is σ = 253798272000. Its totient is φ = 15196239360.

The previous prime is 66552789217. The next prime is 66552789241. The reversal of 66552789240 is 4298725566.

66552789240 is a `hidden beast` number, since 6 + 6 + 552 + 7 + 89 + 2 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66552789241) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8243926 + ... + 8251994.

It is an arithmetic number, because the mean of its divisors is an integer number (991399500).

Almost surely, 2^66552789240 is an apocalyptic number.

66552789240 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 66552789240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (126899136000).

66552789240 is an abundant number, since it is smaller than the sum of its proper divisors (187245482760).

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

66552789240 is a wasteful number, since it uses less digits than its factorization.

66552789240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9187 (or 9177 counting only the distinct ones).

The product of its (nonzero) digits is 7257600, while the sum is 54.

The spelling of 66552789240 in words is "sixty-six billion, five hundred fifty-two million, seven hundred eighty-nine thousand, two hundred forty".