66145513554601 has 12 divisors (see below), whose sum is σ = 71625283989840. Its totient is φ = 61057175116080.

The previous prime is 66145513554587. The next prime is 66145513554649. The reversal of 66145513554601 is 10645531554166.

66145513554601 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 66145513554601 - 2⁷ = 66145513554473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66145513554101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62433786 + ... + 63484396.

It is an arithmetic number, because the mean of its divisors is an integer number (5968773665820).

Almost surely, 2^{66145513554601} is an apocalyptic number.

It is an amenable number.

66145513554601 is a deficient number, since it is larger than the sum of its proper divisors (5479770435239).

66145513554601 is a wasteful number, since it uses less digits than its factorization.

66145513554601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1423176 (or 1423163 counting only the distinct ones).

The product of its (nonzero) digits is 6480000, while the sum is 52.

The spelling of 66145513554601 in words is "sixty-six trillion, one hundred forty-five billion, five hundred thirteen million, five hundred fifty-four thousand, six hundred one".