66555500605 has 16 divisors (see below), whose sum is σ = 87217000128. Its totient is φ = 48354112000.

The previous prime is 66555500597. The next prime is 66555500689. The reversal of 66555500605 is 50600555566.

It is not a de Polignac number, because 66555500605 - 2³ = 66555500597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 569716 + ... + 676525.

It is an arithmetic number, because the mean of its divisors is an integer number (5451062508).

Almost surely, 2^66555500605 is an apocalyptic number.

It is an amenable number.

66555500605 is a deficient number, since it is larger than the sum of its proper divisors (20661499523).

66555500605 is a wasteful number, since it uses less digits than its factorization.

66555500605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247228.

The product of its (nonzero) digits is 675000, while the sum is 43.

The spelling of 66555500605 in words is "sixty-six billion, five hundred fifty-five million, five hundred thousand, six hundred five".