66747265920 has 1280 divisors, whose sum is σ = 273518467200. Its totient is φ = 15415640064.

The previous prime is 66747265891. The next prime is 66747265961. The reversal of 66747265920 is 2956274766.

66747265920 is a `hidden beast` number, since 6 + 6 + 7 + 47 + 2 + 6 + 592 + 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 an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 749969236 + ... + 749969324.

Almost surely, 2^66747265920 is an apocalyptic number.

66747265920 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 66747265920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136759233600).

66747265920 is an abundant number, since it is smaller than the sum of its proper divisors (206771201280).

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

66747265920 is a wasteful number, since it uses less digits than its factorization.

66747265920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197 (or 176 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 54.

The spelling of 66747265920 in words is "sixty-six billion, seven hundred forty-seven million, two hundred sixty-five thousand, nine hundred twenty".