66654430555545 has 24 divisors (see below), whose sum is σ = 132039252910656. Its totient is φ = 30470596825248.

The previous prime is 66654430555501. The next prime is 66654430555591. The reversal of 66654430555545 is 54555503445666.

It is not a de Polignac number, because 66654430555545 - 2⁹ = 66654430555033 is a prime.

It is a super-2 number, since 2×66654430555545² (a number of 28 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 105800683107 + ... + 105800683736.

It is an arithmetic number, because the mean of its divisors is an integer number (5501635537944).

Almost surely, 2^{66654430555545} is an apocalyptic number.

It is an amenable number.

66654430555545 is a deficient number, since it is larger than the sum of its proper divisors (65384822355111).

66654430555545 is a wasteful number, since it uses less digits than its factorization.

66654430555545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211601366861 (or 211601366858 counting only the distinct ones).

The product of its (nonzero) digits is 648000000, while the sum is 63.

The spelling of 66654430555545 in words is "sixty-six trillion, six hundred fifty-four billion, four hundred thirty million, five hundred fifty-five thousand, five hundred forty-five".