121638738650266 has 16 divisors (see below), whose sum is σ = 182518750401480. Its totient is φ = 60799155877440.

The previous prime is 121638738650257. The next prime is 121638738650269. The reversal of 121638738650266 is 662056837836121.

It can be written as a sum of positive squares in 4 ways, for example, as 27488996570025 + 94149742080241 = 5242995^2 + 9703079^2 .

It is a junction number, because it is equal to n+sod(n) for n = 121638738650198 and 121638738650207.

It is not an unprimeable number, because it can be changed into a prime (121638738650269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 443351520 + ... + 443625796.

Almost surely, 2^{121638738650266} is an apocalyptic number.

121638738650266 is a deficient number, since it is larger than the sum of its proper divisors (60880011751214).

121638738650266 is a wasteful number, since it uses less digits than its factorization.

121638738650266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347169.

The product of its (nonzero) digits is 104509440, while the sum is 64.

The spelling of 121638738650266 in words is "one hundred twenty-one trillion, six hundred thirty-eight billion, seven hundred thirty-eight million, six hundred fifty thousand, two hundred sixty-six".