12520165663 has 4 divisors (see below), whose sum is σ = 12526651368. Its totient is φ = 12513679960.

The previous prime is 12520165639. The next prime is 12520165711. The reversal of 12520165663 is 36656102521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36656102521 = 41 ⋅894051281.

It is a cyclic number.

It is not a de Polignac number, because 12520165663 - 2¹³ = 12520157471 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 (12520165963) 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, 3239956 + ... + 3243817.

It is an arithmetic number, because the mean of its divisors is an integer number (3131662842).

Almost surely, 2^12520165663 is an apocalyptic number.

12520165663 is a deficient number, since it is larger than the sum of its proper divisors (6485705).

12520165663 is an equidigital number, since it uses as much as digits as its factorization.

12520165663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6485704.

The product of its (nonzero) digits is 64800, while the sum is 37.

The spelling of 12520165663 in words is "twelve billion, five hundred twenty million, one hundred sixty-five thousand, six hundred sixty-three".