66532097520 has 280 divisors, whose sum is σ = 265058306016. Its totient is φ = 15207243264.

The previous prime is 66532097507. The next prime is 66532097531. The reversal of 66532097520 is 2579023566.

66532097520 is a `hidden beast` number, since 6 + 6 + 5 + 32 + 0 + 97 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (280).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 326754 + ... + 489726.

Almost surely, 2^66532097520 is an apocalyptic number.

66532097520 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 66532097520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132529153008).

66532097520 is an abundant number, since it is smaller than the sum of its proper divisors (198526208496).

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

66532097520 is a wasteful number, since it uses less digits than its factorization.

66532097520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163011 (or 162990 counting only the distinct ones).

The product of its (nonzero) digits is 680400, while the sum is 45.

The spelling of 66532097520 in words is "sixty-six billion, five hundred thirty-two million, ninety-seven thousand, five hundred twenty".