12254515320661 has 4 divisors (see below), whose sum is σ = 12254522641612. Its totient is φ = 12254507999712.

The previous prime is 12254515320623. The next prime is 12254515320683. The reversal of 12254515320661 is 16602351545221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 11275029024561 + 979486296100 = 3357831^2 + 989690^2 .

It is a cyclic number.

It is not a de Polignac number, because 12254515320661 - 2⁹ = 12254515320149 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 (12254515320361) 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, 225475 + ... + 4955791.

It is an arithmetic number, because the mean of its divisors is an integer number (3063630660403).

Almost surely, 2^{12254515320661} is an apocalyptic number.

It is an amenable number.

12254515320661 is a deficient number, since it is larger than the sum of its proper divisors (7320951).

12254515320661 is an equidigital number, since it uses as much as digits as its factorization.

12254515320661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7320950.

The product of its (nonzero) digits is 432000, while the sum is 43.

Adding to 12254515320661 its reverse (16602351545221), we get a palindrome (28856866865882).

The spelling of 12254515320661 in words is "twelve trillion, two hundred fifty-four billion, five hundred fifteen million, three hundred twenty thousand, six hundred sixty-one".