66653988207578 has 16 divisors (see below), whose sum is σ = 104337370264896. Its totient is φ = 31875125583840.

The previous prime is 66653988207511. The next prime is 66653988207589. The reversal of 66653988207578 is 87570288935666.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64682708 + ... + 65705103.

It is an arithmetic number, because the mean of its divisors is an integer number (6521085641556).

Almost surely, 2^{66653988207578} is an apocalyptic number.

66653988207578 is a deficient number, since it is larger than the sum of its proper divisors (37683382057318).

66653988207578 is a wasteful number, since it uses less digits than its factorization.

66653988207578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130398949.

The product of its (nonzero) digits is 7315660800, while the sum is 80.

The spelling of 66653988207578 in words is "sixty-six trillion, six hundred fifty-three billion, nine hundred eighty-eight million, two hundred seven thousand, five hundred seventy-eight".