66551602171 has 8 divisors (see below), whose sum is σ = 68065129440. Its totient is φ = 65047624512.

The previous prime is 66551602153. The next prime is 66551602177. The reversal of 66551602171 is 17120615566.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66551602171 - 2¹¹ = 66551600123 is a prime.

It is a Duffinian 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, 2373306 + ... + 2401183.

It is an arithmetic number, because the mean of its divisors is an integer number (8508141180).

Almost surely, 2^66551602171 is an apocalyptic number.

66551602171 is a deficient number, since it is larger than the sum of its proper divisors (1513527269).

66551602171 is a wasteful number, since it uses less digits than its factorization.

66551602171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4774805.

The product of its (nonzero) digits is 75600, while the sum is 40.

The spelling of 66551602171 in words is "sixty-six billion, five hundred fifty-one million, six hundred two thousand, one hundred seventy-one".