12528774977 has 4 divisors (see below), whose sum is σ = 12652822356. Its totient is φ = 12404727600.

The previous prime is 12528774877. The next prime is 12528774989. The reversal of 12528774977 is 77947782521.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77947782521 = 7 ⋅11135397503.

It can be written as a sum of positive squares in 2 ways, for example, as 7229080576 + 5299694401 = 85024^2 + 72799^2 .

It is a cyclic number.

It is not a de Polignac number, because 12528774977 - 2²⁸ = 12260339521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12528774877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62023538 + ... + 62023739.

It is an arithmetic number, because the mean of its divisors is an integer number (3163205589).

Almost surely, 2^12528774977 is an apocalyptic number.

It is an amenable number.

12528774977 is a deficient number, since it is larger than the sum of its proper divisors (124047379).

12528774977 is a wasteful number, since it uses less digits than its factorization.

12528774977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124047378.

The product of its digits is 13829760, while the sum is 59.

The spelling of 12528774977 in words is "twelve billion, five hundred twenty-eight million, seven hundred seventy-four thousand, nine hundred seventy-seven".