121665303265 has 32 divisors (see below), whose sum is σ = 174455026560. Its totient is φ = 80407219200.

The previous prime is 121665303233. The next prime is 121665303271. The reversal of 121665303265 is 562303566121.

It is not a de Polignac number, because 121665303265 - 2⁵ = 121665303233 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2216391 + ... + 2270620.

It is an arithmetic number, because the mean of its divisors is an integer number (5451719580).

Almost surely, 2^121665303265 is an apocalyptic number.

It is an amenable number.

121665303265 is a deficient number, since it is larger than the sum of its proper divisors (52789723295).

121665303265 is a wasteful number, since it uses less digits than its factorization.

121665303265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4487073.

The product of its (nonzero) digits is 194400, while the sum is 40.

Adding to 121665303265 its reverse (562303566121), we get a palindrome (683968869386).

The spelling of 121665303265 in words is "one hundred twenty-one billion, six hundred sixty-five million, three hundred three thousand, two hundred sixty-five".