12920779553 has 4 divisors (see below), whose sum is σ = 14095395888. Its totient is φ = 11746163220.

The previous prime is 12920779519. The next prime is 12920779577. The reversal of 12920779553 is 35597702921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12920779553 - 2⁶ = 12920779489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12920773553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 587308151 + ... + 587308172.

It is an arithmetic number, because the mean of its divisors is an integer number (3523848972).

Almost surely, 2^12920779553 is an apocalyptic number.

It is an amenable number.

12920779553 is a deficient number, since it is larger than the sum of its proper divisors (1174616335).

12920779553 is a wasteful number, since it uses less digits than its factorization.

12920779553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1174616334.

The product of its (nonzero) digits is 1190700, while the sum is 50.

The spelling of 12920779553 in words is "twelve billion, nine hundred twenty million, seven hundred seventy-nine thousand, five hundred fifty-three".