12661267531 has 8 divisors (see below), whose sum is σ = 14624779824. Its totient is φ = 10833169920.

The previous prime is 12661267517. The next prime is 12661267559. The reversal of 12661267531 is 13576216621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12661267531 - 2⁹ = 12661267019 is a prime.

It is a super-2 number, since 2×12661267531² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12661267501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33853470 + ... + 33853843.

It is an arithmetic number, because the mean of its divisors is an integer number (1828097478).

Almost surely, 2^12661267531 is an apocalyptic number.

12661267531 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12661267531 is a deficient number, since it is larger than the sum of its proper divisors (1963512293).

12661267531 is a wasteful number, since it uses less digits than its factorization.

12661267531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67707341.

The product of its digits is 90720, while the sum is 40.

The spelling of 12661267531 in words is "twelve billion, six hundred sixty-one million, two hundred sixty-seven thousand, five hundred thirty-one".