220625987913 has 12 divisors (see below), whose sum is σ = 337427981748. Its totient is φ = 138431992320.

The previous prime is 220625987909. The next prime is 220625987929. The reversal of 220625987913 is 319789526022.

220625987913 is a `hidden beast` number, since 2 + 2 + 0 + 625 + 9 + 8 + 7 + 9 + 1 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 194668911369 + 25957076544 = 441213^2 + 161112^2 .

It is not a de Polignac number, because 220625987913 - 2² = 220625987909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 220625987913.

It is not an unprimeable number, because it can be changed into a prime (220625987983) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 720999808 + ... + 721000113.

It is an arithmetic number, because the mean of its divisors is an integer number (28118998479).

Almost surely, 2^220625987913 is an apocalyptic number.

It is an amenable number.

220625987913 is a deficient number, since it is larger than the sum of its proper divisors (116801993835).

220625987913 is a wasteful number, since it uses less digits than its factorization.

220625987913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441999944 (or 1441999941 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The spelling of 220625987913 in words is "two hundred twenty billion, six hundred twenty-five million, nine hundred eighty-seven thousand, nine hundred thirteen".