609721199999 has 4 divisors (see below), whose sum is σ = 616006985664. Its totient is φ = 603435414336.

The previous prime is 609721199953. The next prime is 609721200007. The reversal of 609721199999 is 999991127906.

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 609721199999 - 2²⁴ = 609704422783 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 (609721190999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3142892687 + ... + 3142892880.

It is an arithmetic number, because the mean of its divisors is an integer number (154001746416).

Almost surely, 2^609721199999 is an apocalyptic number.

609721199999 is a deficient number, since it is larger than the sum of its proper divisors (6285785665).

609721199999 is an equidigital number, since it uses as much as digits as its factorization.

609721199999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6285785664.

The product of its (nonzero) digits is 44641044, while the sum is 71.

The spelling of 609721199999 in words is "six hundred nine billion, seven hundred twenty-one million, one hundred ninety-nine thousand, nine hundred ninety-nine".