220979538009 has 6 divisors (see below), whose sum is σ = 319192666026. Its totient is φ = 147319692000.

The previous prime is 220979537963. The next prime is 220979538037. The reversal of 220979538009 is 900835979022.

It can be written as a sum of positive squares in only one way, i.e., 217076787225 + 3902750784 = 465915^2 + 62472^2 .

It is not a de Polignac number, because 220979538009 - 2⁷ = 220979537881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (220979528009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12276640992 + ... + 12276641009.

It is an arithmetic number, because the mean of its divisors is an integer number (53198777671).

Almost surely, 2^220979538009 is an apocalyptic number.

It is an amenable number.

220979538009 is a deficient number, since it is larger than the sum of its proper divisors (98213128017).

220979538009 is a wasteful number, since it uses less digits than its factorization.

220979538009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24553282007 (or 24553282004 counting only the distinct ones).

The product of its (nonzero) digits is 2449440, while the sum is 54.

The spelling of 220979538009 in words is "two hundred twenty billion, nine hundred seventy-nine million, five hundred thirty-eight thousand, nine".