66071220641 has 8 divisors (see below), whose sum is σ = 68946686784. Its totient is φ = 63195988240.

The previous prime is 66071220599. The next prime is 66071220643. The reversal of 66071220641 is 14602217066.

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 66071220641 - 2²⁶ = 66004111777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66071220643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 768095 + ... + 849771.

It is an arithmetic number, because the mean of its divisors is an integer number (8618335848).

Almost surely, 2^66071220641 is an apocalyptic number.

It is an amenable number.

66071220641 is a deficient number, since it is larger than the sum of its proper divisors (2875466143).

66071220641 is a wasteful number, since it uses less digits than its factorization.

66071220641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116871.

The product of its (nonzero) digits is 24192, while the sum is 35.

The spelling of 66071220641 in words is "sixty-six billion, seventy-one million, two hundred twenty thousand, six hundred forty-one".