121644740268 has 18 divisors (see below), whose sum is σ = 307490871324. Its totient is φ = 40548246744.

The previous prime is 121644740263. The next prime is 121644740333. The reversal of 121644740268 is 862047446121.

121644740268 is a `hidden beast` number, since 12 + 164 + 474 + 0 + 2 + 6 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (121644740263) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1689510246 + ... + 1689510317.

Almost surely, 2^121644740268 is an apocalyptic number.

121644740268 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

121644740268 is an abundant number, since it is smaller than the sum of its proper divisors (185846131056).

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

121644740268 is a wasteful number, since it uses less digits than its factorization.

121644740268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3379020573 (or 3379020568 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The spelling of 121644740268 in words is "one hundred twenty-one billion, six hundred forty-four million, seven hundred forty thousand, two hundred sixty-eight".