121661266 has 4 divisors (see below), whose sum is σ = 182491902. Its totient is φ = 60830632.

The previous prime is 121661261. The next prime is 121661297. The reversal of 121661266 is 662166121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 102921025 + 18740241 = 10145^2 + 4329^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (121661261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30415315 + ... + 30415318.

Almost surely, 2^121661266 is an apocalyptic number.

121661266 is a deficient number, since it is larger than the sum of its proper divisors (60830636).

121661266 is an equidigital number, since it uses as much as digits as its factorization.

121661266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60830635.

The product of its digits is 5184, while the sum is 31.

The square root of 121661266 is about 11030.0165911027. The cubic root of 121661266 is about 495.5081215663.

The spelling of 121661266 in words is "one hundred twenty-one million, six hundred sixty-one thousand, two hundred sixty-six".