66551602173 has 16 divisors (see below), whose sum is σ = 101436994176. Its totient is φ = 38020101120.

The previous prime is 66551602153. The next prime is 66551602177. The reversal of 66551602173 is 37120615566.

It is not a de Polignac number, because 66551602173 - 2¹² = 66551598077 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 303508 + ... + 474573.

It is an arithmetic number, because the mean of its divisors is an integer number (6339812136).

Almost surely, 2^66551602173 is an apocalyptic number.

It is an amenable number.

66551602173 is a deficient number, since it is larger than the sum of its proper divisors (34885392003).

66551602173 is a wasteful number, since it uses less digits than its factorization.

66551602173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 782164.

The product of its (nonzero) digits is 226800, while the sum is 42.

The spelling of 66551602173 in words is "sixty-six billion, five hundred fifty-one million, six hundred two thousand, one hundred seventy-three".