121968720566 has 32 divisors (see below), whose sum is σ = 228292473600. Its totient is φ = 47479629600.

The previous prime is 121968720547. The next prime is 121968720569. The reversal of 121968720566 is 665027869121.

It is a super-3 number, since 3×121968720566³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121968720569) 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 15 ways as a sum of consecutive naturals, for example, 157841 + ... + 518508.

It is an arithmetic number, because the mean of its divisors is an integer number (7134139800).

Almost surely, 2^121968720566 is an apocalyptic number.

121968720566 is a deficient number, since it is larger than the sum of its proper divisors (106323753034).

121968720566 is a wasteful number, since it uses less digits than its factorization.

121968720566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 677540.

The product of its (nonzero) digits is 2177280, while the sum is 53.

The spelling of 121968720566 in words is "one hundred twenty-one billion, nine hundred sixty-eight million, seven hundred twenty thousand, five hundred sixty-six".