12135830261 has 4 divisors (see below), whose sum is σ = 12136538124. Its totient is φ = 12135122400.

The previous prime is 12135830173. The next prime is 12135830263. The reversal of 12135830261 is 16203853121.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5185440100 + 6950390161 = 72010^2 + 83369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12135830261 is a prime.

It is a super-2 number, since 2×12135830261² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12135830263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327560 + ... + 362721.

It is an arithmetic number, because the mean of its divisors is an integer number (3034134531).

Almost surely, 2^12135830261 is an apocalyptic number.

It is an amenable number.

12135830261 is a deficient number, since it is larger than the sum of its proper divisors (707863).

12135830261 is an equidigital number, since it uses as much as digits as its factorization.

12135830261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707862.

The product of its (nonzero) digits is 8640, while the sum is 32.

The spelling of 12135830261 in words is "twelve billion, one hundred thirty-five million, eight hundred thirty thousand, two hundred sixty-one".