12520164406 has 4 divisors (see below), whose sum is σ = 18780246612. Its totient is φ = 6260082202.

The previous prime is 12520164389. The next prime is 12520164407. The reversal of 12520164406 is 60446102521.

It is a happy number.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12520164407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3130041100 + ... + 3130041103.

It is an arithmetic number, because the mean of its divisors is an integer number (4695061653).

Almost surely, 2^12520164406 is an apocalyptic number.

12520164406 is a deficient number, since it is larger than the sum of its proper divisors (6260082206).

12520164406 is an equidigital number, since it uses as much as digits as its factorization.

12520164406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6260082205.

The product of its (nonzero) digits is 11520, while the sum is 31.

Adding to 12520164406 its reverse (60446102521), we get a palindrome (72966266927).

The spelling of 12520164406 in words is "twelve billion, five hundred twenty million, one hundred sixty-four thousand, four hundred six".