121720566767 has 8 divisors (see below), whose sum is σ = 126159528240. Its totient is φ = 117297718720.

The previous prime is 121720566733. The next prime is 121720566823. The reversal of 121720566767 is 767665027121.

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 121720566767 - 2⁶ = 121720566703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121720466767) 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 7 ways as a sum of consecutive naturals, for example, 4012973 + ... + 4043190.

It is an arithmetic number, because the mean of its divisors is an integer number (15769941030).

Almost surely, 2^121720566767 is an apocalyptic number.

121720566767 is a deficient number, since it is larger than the sum of its proper divisors (4438961473).

121720566767 is an equidigital number, since it uses as much as digits as its factorization.

121720566767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8056713.

The product of its (nonzero) digits is 1481760, while the sum is 50.

The spelling of 121720566767 in words is "one hundred twenty-one billion, seven hundred twenty million, five hundred sixty-six thousand, seven hundred sixty-seven".