66499999999 has 8 divisors (see below), whose sum is σ = 67934750400. Its totient is φ = 65066077056.

The previous prime is 66499999997. The next prime is 66500000011. The reversal of 66499999999 is 99999999466.

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 66499999999 - 2¹ = 66499999997 is a prime.

It is a Duffinian number.

66499999999 is a modest number, since divided by 999999 gives 66499 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66499999991) 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, 43014 + ... + 367219.

It is an arithmetic number, because the mean of its divisors is an integer number (8491843800).

Almost surely, 2^66499999999 is an apocalyptic number.

66499999999 is a deficient number, since it is larger than the sum of its proper divisors (1434750401).

66499999999 is a wasteful number, since it uses less digits than its factorization.

66499999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413729.

The product of its digits is 6198727824, while the sum is 88.

The spelling of 66499999999 in words is "sixty-six billion, four hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".