121665303264 has 24 divisors (see below), whose sum is σ = 319371421320. Its totient is φ = 40555101056.

The previous prime is 121665303233. The next prime is 121665303271. The reversal of 121665303264 is 462303566121.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 633673359 + ... + 633673550.

It is an arithmetic number, because the mean of its divisors is an integer number (13307142555).

Almost surely, 2^121665303264 is an apocalyptic number.

It is an amenable number.

121665303264 is an abundant number, since it is smaller than the sum of its proper divisors (197706118056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121665303264 is a wasteful number, since it uses less digits than its factorization.

121665303264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267346922 (or 1267346914 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

Adding to 121665303264 its reverse (462303566121), we get a palindrome (583968869385).

It can be divided in two parts, 12166 and 5303264, that added together give a triangular number (5315430 = T₃₂₆₀).

The spelling of 121665303264 in words is "one hundred twenty-one billion, six hundred sixty-five million, three hundred three thousand, two hundred sixty-four".