12261651320591 has 8 divisors (see below), whose sum is σ = 12698864715600. Its totient is φ = 11825397781120.

The previous prime is 12261651320587. The next prime is 12261651320599. The reversal of 12261651320591 is 19502315616221.

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

It is not a de Polignac number, because 12261651320591 - 2² = 12261651320587 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12261651320599) 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, 239937881 + ... + 239988978.

It is an arithmetic number, because the mean of its divisors is an integer number (1587358089450).

Almost surely, 2^{12261651320591} is an apocalyptic number.

12261651320591 is a deficient number, since it is larger than the sum of its proper divisors (437213395009).

12261651320591 is an equidigital number, since it uses as much as digits as its factorization.

12261651320591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479927769.

The product of its (nonzero) digits is 194400, while the sum is 44.

The spelling of 12261651320591 in words is "twelve trillion, two hundred sixty-one billion, six hundred fifty-one million, three hundred twenty thousand, five hundred ninety-one".