12505215430451 has 8 divisors (see below), whose sum is σ = 12564616641984. Its totient is φ = 12445815490920.

The previous prime is 12505215430447. The next prime is 12505215430483. The reversal of 12505215430451 is 15403451250521.

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 12505215430451 - 2² = 12505215430447 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12505215430151) 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, 23680376 + ... + 24202698.

It is an arithmetic number, because the mean of its divisors is an integer number (1570577080248).

Almost surely, 2^{12505215430451} is an apocalyptic number.

12505215430451 is a deficient number, since it is larger than the sum of its proper divisors (59401211533).

12505215430451 is a wasteful number, since it uses less digits than its factorization.

12505215430451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636001.

The product of its (nonzero) digits is 120000, while the sum is 38.

Adding to 12505215430451 its reverse (15403451250521), we get a palindrome (27908666680972).

The spelling of 12505215430451 in words is "twelve trillion, five hundred five billion, two hundred fifteen million, four hundred thirty thousand, four hundred fifty-one".