121724006665 has 8 divisors (see below), whose sum is σ = 146187474048. Its totient is φ = 97300094640.

The previous prime is 121724006641. The next prime is 121724006671. The reversal of 121724006665 is 566600427121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121724006665 - 2⁵ = 121724006633 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9882067 + ... + 9894376.

It is an arithmetic number, because the mean of its divisors is an integer number (18273434256).

Almost surely, 2^121724006665 is an apocalyptic number.

It is an amenable number.

121724006665 is a deficient number, since it is larger than the sum of its proper divisors (24463467383).

121724006665 is a wasteful number, since it uses less digits than its factorization.

121724006665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19777679.

The product of its (nonzero) digits is 120960, while the sum is 40.

The spelling of 121724006665 in words is "one hundred twenty-one billion, seven hundred twenty-four million, six thousand, six hundred sixty-five".