66903217919 has 8 divisors (see below), whose sum is σ = 71248176720. Its totient is φ = 62603756416.

The previous prime is 66903217883. The next prime is 66903217937. The reversal of 66903217919 is 91971230966.

It is a happy number.

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 66903217919 - 2⁸ = 66903217663 is a prime.

It is a super-2 number, since 2×66903217919² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66903217019) 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, 11371289 + ... + 11377170.

It is an arithmetic number, because the mean of its divisors is an integer number (8906022090).

Almost surely, 2^66903217919 is an apocalyptic number.

66903217919 is a deficient number, since it is larger than the sum of its proper divisors (4344958801).

66903217919 is a wasteful number, since it uses less digits than its factorization.

66903217919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22748649.

The product of its (nonzero) digits is 1102248, while the sum is 53.

The spelling of 66903217919 in words is "sixty-six billion, nine hundred three million, two hundred seventeen thousand, nine hundred nineteen".