66511506213072 has 120 divisors (see below), whose sum is σ = 186352619002368. Its totient is φ = 22145167238400.

The previous prime is 66511506213071. The next prime is 66511506213143. The reversal of 66511506213072 is 27031260511566.

66511506213072 is a `hidden beast` number, since 6 + 6 + 5 + 1 + 1 + 506 + 2 + 130 + 7 + 2 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66511506213071) 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, 805270497 + ... + 805353087.

Almost surely, 2^{66511506213072} is an apocalyptic number.

It is an amenable number.

66511506213072 is an abundant number, since it is smaller than the sum of its proper divisors (119841112789296).

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

66511506213072 is a wasteful number, since it uses less digits than its factorization.

66511506213072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88929 (or 88920 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 45.

The spelling of 66511506213072 in words is "sixty-six trillion, five hundred eleven billion, five hundred six million, two hundred thirteen thousand, seventy-two".