12261651320635 has 4 divisors (see below), whose sum is σ = 14713981584768. Its totient is φ = 9809321056504.

The previous prime is 12261651320599. The next prime is 12261651320641. The reversal of 12261651320635 is 53602315616221.

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

It is a cyclic number.

It is not a de Polignac number, because 12261651320635 - 2⁷ = 12261651320507 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12261651320591 and 12261651320600.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1226165132059 + ... + 1226165132068.

It is an arithmetic number, because the mean of its divisors is an integer number (3678495396192).

Almost surely, 2^{12261651320635} is an apocalyptic number.

12261651320635 is a deficient number, since it is larger than the sum of its proper divisors (2452330264133).

12261651320635 is an equidigital number, since it uses as much as digits as its factorization.

12261651320635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2452330264132.

The product of its (nonzero) digits is 388800, while the sum is 43.

Adding to 12261651320635 its reverse (53602315616221), we get a palindrome (65863966936856).

The spelling of 12261651320635 in words is "twelve trillion, two hundred sixty-one billion, six hundred fifty-one million, three hundred twenty thousand, six hundred thirty-five".