5511573721 has 4 divisors (see below), whose sum is σ = 5615565732. Its totient is φ = 5407581712.

The previous prime is 5511573679. The next prime is 5511573733. The reversal of 5511573721 is 1273751155.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2120142025 + 3391431696 = 46045^2 + 58236^2 .

It is a cyclic number.

It is not a de Polignac number, because 5511573721 - 2¹⁷ = 5511442649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5511571721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51995926 + ... + 51996031.

It is an arithmetic number, because the mean of its divisors is an integer number (1403891433).

Almost surely, 2^5511573721 is an apocalyptic number.

It is an amenable number.

5511573721 is a deficient number, since it is larger than the sum of its proper divisors (103992011).

5511573721 is a wasteful number, since it uses less digits than its factorization.

5511573721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103992010.

The product of its digits is 36750, while the sum is 37.

The square root of 5511573721 is about 74239.9738752648. The cubic root of 5511573721 is about 1766.4114597811.

The spelling of 5511573721 in words is "five billion, five hundred eleven million, five hundred seventy-three thousand, seven hundred twenty-one".