12261664271 has 2 divisors, whose sum is σ = 12261664272. Its totient is φ = 12261664270.

The previous prime is 12261664249. The next prime is 12261664279. The reversal of 12261664271 is 17246616221.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12261664271 - 2¹⁰ = 12261663247 is a prime.

It is a super-2 number, since 2×12261664271² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12261664279) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6130832135 + 6130832136.

It is an arithmetic number, because the mean of its divisors is an integer number (6130832136).

Almost surely, 2^12261664271 is an apocalyptic number.

12261664271 is a deficient number, since it is larger than the sum of its proper divisors (1).

12261664271 is an equidigital number, since it uses as much as digits as its factorization.

12261664271 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 38.

The spelling of 12261664271 in words is "twelve billion, two hundred sixty-one million, six hundred sixty-four thousand, two hundred seventy-one".