7211558745 has 12 divisors (see below), whose sum is σ = 12500035236. Its totient is φ = 3846164640.

The previous prime is 7211558723. The next prime is 7211558747. The reversal of 7211558745 is 5478551127.

7211558745 is a `hidden beast` number, since 7 + 21 + 1 + 5 + 587 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3065615424 + 4145943321 = 55368^2 + 64389^2 .

It is not a de Polignac number, because 7211558745 - 2⁷ = 7211558617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 160256861 = 7211558745 / (7 + 2 + 1 + 1 + 5 + 5 + 8 + 7 + 4 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 7211558745.

It is not an unprimeable number, because it can be changed into a prime (7211558747) 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, 80128386 + ... + 80128475.

It is an arithmetic number, because the mean of its divisors is an integer number (1041669603).

Almost surely, 2^7211558745 is an apocalyptic number.

It is an amenable number.

7211558745 is a deficient number, since it is larger than the sum of its proper divisors (5288476491).

7211558745 is a wasteful number, since it uses less digits than its factorization.

7211558745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160256872 (or 160256869 counting only the distinct ones).

The product of its digits is 392000, while the sum is 45.

The square root of 7211558745 is about 84920.8969865486. The cubic root of 7211558745 is about 1932.0115357836.

The spelling of 7211558745 in words is "seven billion, two hundred eleven million, five hundred fifty-eight thousand, seven hundred forty-five".