66998063807 has 8 divisors (see below), whose sum is σ = 67464672912. Its totient is φ = 66533040000.

The previous prime is 66998063791. The next prime is 66998063813. The reversal of 66998063807 is 70836089966.

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 66998063807 - 2⁴ = 66998063791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66998063807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66998063857) 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, 311444 + ... + 480617.

It is an arithmetic number, because the mean of its divisors is an integer number (8433084114).

Almost surely, 2^66998063807 is an apocalyptic number.

66998063807 is a deficient number, since it is larger than the sum of its proper divisors (466609105).

66998063807 is a wasteful number, since it uses less digits than its factorization.

66998063807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792649.

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

The spelling of 66998063807 in words is "sixty-six billion, nine hundred ninety-eight million, sixty-three thousand, eight hundred seven".