66501616327 has 4 divisors (see below), whose sum is σ = 67090126320. Its totient is φ = 65913106336.

The previous prime is 66501616309. The next prime is 66501616367. The reversal of 66501616327 is 72361610566.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66501616327 - 2¹⁹ = 66501092039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66501616367) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294254827 + ... + 294255052.

It is an arithmetic number, because the mean of its divisors is an integer number (16772531580).

Almost surely, 2^66501616327 is an apocalyptic number.

66501616327 is a deficient number, since it is larger than the sum of its proper divisors (588509993).

66501616327 is a wasteful number, since it uses less digits than its factorization.

66501616327 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588509992.

The product of its (nonzero) digits is 272160, while the sum is 43.

The spelling of 66501616327 in words is "sixty-six billion, five hundred one million, six hundred sixteen thousand, three hundred twenty-seven".