12577503721 has 4 divisors (see below), whose sum is σ = 12917436292. Its totient is φ = 12237571152.

The previous prime is 12577503707. The next prime is 12577503727. The reversal of 12577503721 is 12730577521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12730577521 = 31 ⋅410663791.

It can be written as a sum of positive squares in 2 ways, for example, as 4962498025 + 7615005696 = 70445^2 + 87264^2 .

It is a cyclic number.

It is not a de Polignac number, because 12577503721 - 2⁵ = 12577503689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12577503727) 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, 169966230 + ... + 169966303.

It is an arithmetic number, because the mean of its divisors is an integer number (3229359073).

Almost surely, 2^12577503721 is an apocalyptic number.

It is an amenable number.

12577503721 is a deficient number, since it is larger than the sum of its proper divisors (339932571).

12577503721 is an equidigital number, since it uses as much as digits as its factorization.

12577503721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339932570.

The product of its (nonzero) digits is 102900, while the sum is 40.

The spelling of 12577503721 in words is "twelve billion, five hundred seventy-seven million, five hundred three thousand, seven hundred twenty-one".