66551602172 has 24 divisors (see below), whose sum is σ = 127068775680. Its totient is φ = 30246986160.

The previous prime is 66551602153. The next prime is 66551602177. The reversal of 66551602172 is 27120615566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66551602177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283229 + ... + 461867.

It is an arithmetic number, because the mean of its divisors is an integer number (5294532320).

Almost surely, 2^66551602172 is an apocalyptic number.

It is an amenable number.

66551602172 is a deficient number, since it is larger than the sum of its proper divisors (60517173508).

66551602172 is a wasteful number, since it uses less digits than its factorization.

66551602172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 187121 (or 187119 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 66551602172 in words is "sixty-six billion, five hundred fifty-one million, six hundred two thousand, one hundred seventy-two".