66869046971 has 4 divisors (see below), whose sum is σ = 66877596000. Its totient is φ = 66860497944.

The previous prime is 66869046949. The next prime is 66869046989. The reversal of 66869046971 is 17964096866.

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 66869046971 - 2²² = 66864852667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66869046991) 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, 4262771 + ... + 4278428.

It is an arithmetic number, because the mean of its divisors is an integer number (16719399000).

Almost surely, 2^66869046971 is an apocalyptic number.

66869046971 is a deficient number, since it is larger than the sum of its proper divisors (8549029).

66869046971 is an equidigital number, since it uses as much as digits as its factorization.

66869046971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8549028.

The product of its (nonzero) digits is 23514624, while the sum is 62.

The spelling of 66869046971 in words is "sixty-six billion, eight hundred sixty-nine million, forty-six thousand, nine hundred seventy-one".