66354199999 has 4 divisors (see below), whose sum is σ = 66355046440. Its totient is φ = 66353353560.

The previous prime is 66354199979. The next prime is 66354200111. The reversal of 66354199999 is 99999145366.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66354199999 - 2¹¹ = 66354197951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66354199979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 292089 + ... + 466930.

It is an arithmetic number, because the mean of its divisors is an integer number (16588761610).

Almost surely, 2^66354199999 is an apocalyptic number.

66354199999 is a deficient number, since it is larger than the sum of its proper divisors (846441).

66354199999 is an equidigital number, since it uses as much as digits as its factorization.

66354199999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 846440.

The product of its digits is 127545840, while the sum is 70.

The spelling of 66354199999 in words is "sixty-six billion, three hundred fifty-four million, one hundred ninety-nine thousand, nine hundred ninety-nine".