66025721655006 has 16 divisors (see below), whose sum is σ = 132059828250000. Its totient is φ = 22007176395008.

The previous prime is 66025721654927. The next prime is 66025721655073. The reversal of 66025721655006 is 60055612752066.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66025721655006.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 349270131 + ... + 349459118.

It is an arithmetic number, because the mean of its divisors is an integer number (8253739265625).

Almost surely, 2^{66025721655006} is an apocalyptic number.

66025721655006 is an abundant number, since it is smaller than the sum of its proper divisors (66034106594994).

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

66025721655006 is a wasteful number, since it uses less digits than its factorization.

66025721655006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698745003.

The product of its (nonzero) digits is 4536000, while the sum is 51.

The spelling of 66025721655006 in words is "sixty-six trillion, twenty-five billion, seven hundred twenty-one million, six hundred fifty-five thousand, six".