66512336016571 has 4 divisors (see below), whose sum is σ = 68657895242944. Its totient is φ = 64366776790200.

The previous prime is 66512336016541. The next prime is 66512336016583. The reversal of 66512336016571 is 17561063321566.

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 66512336016571 - 2¹⁹ = 66512335492283 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66512336016541) 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, 1072779613140 + ... + 1072779613201.

It is an arithmetic number, because the mean of its divisors is an integer number (17164473810736).

Almost surely, 2^{66512336016571} is an apocalyptic number.

66512336016571 is a deficient number, since it is larger than the sum of its proper divisors (2145559226373).

66512336016571 is a wasteful number, since it uses less digits than its factorization.

66512336016571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2145559226372.

The product of its (nonzero) digits is 4082400, while the sum is 52.

The spelling of 66512336016571 in words is "sixty-six trillion, five hundred twelve billion, three hundred thirty-six million, sixteen thousand, five hundred seventy-one".