66968964241921 has 8 divisors (see below), whose sum is σ = 76536658439424. Its totient is φ = 57401444870880.

The previous prime is 66968964241901. The next prime is 66968964241951. The reversal of 66968964241921 is 12914246986966.

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 66968964241921 - 2²⁵ = 66968930687489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66968964241901) 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, 42884740 + ... + 44418901.

It is an arithmetic number, because the mean of its divisors is an integer number (9567082304928).

Almost surely, 2^{66968964241921} is an apocalyptic number.

It is an amenable number.

66968964241921 is a deficient number, since it is larger than the sum of its proper divisors (9567694197503).

66968964241921 is a wasteful number, since it uses less digits than its factorization.

66968964241921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87413231.

The product of its digits is 483729408, while the sum is 73.

The spelling of 66968964241921 in words is "sixty-six trillion, nine hundred sixty-eight billion, nine hundred sixty-four million, two hundred forty-one thousand, nine hundred twenty-one".