66520165140 has 192 divisors, whose sum is σ = 243132261120. Its totient is φ = 14885614080.

The previous prime is 66520165133. The next prime is 66520165157. The reversal of 66520165140 is 4156102566.

66520165140 is a `hidden beast` number, since 66 + 520 + 1 + 65 + 14 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 66520165095 and 66520165104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 353499 + ... + 507938.

It is an arithmetic number, because the mean of its divisors is an integer number (1266313860).

Almost surely, 2^66520165140 is an apocalyptic number.

66520165140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66520165140 is an abundant number, since it is smaller than the sum of its proper divisors (176612095980).

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

66520165140 is a wasteful number, since it uses less digits than its factorization.

66520165140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861479 (or 861471 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The spelling of 66520165140 in words is "sixty-six billion, five hundred twenty million, one hundred sixty-five thousand, one hundred forty".