5561172805 has 8 divisors (see below), whose sum is σ = 6677533944. Its totient is φ = 4446187200.

The previous prime is 5561172803. The next prime is 5561172811. The reversal of 5561172805 is 5082711655.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2434238244 + 3126934561 = 49338^2 + 55919^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 5561172805 - 2¹ = 5561172803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5561172803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 334966 + ... + 351175.

It is an arithmetic number, because the mean of its divisors is an integer number (834691743).

Almost surely, 2^5561172805 is an apocalyptic number.

It is an amenable number.

5561172805 is a deficient number, since it is larger than the sum of its proper divisors (1116361139).

5561172805 is a wasteful number, since it uses less digits than its factorization.

5561172805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 687767.

The product of its (nonzero) digits is 84000, while the sum is 40.

The square root of 5561172805 is about 74573.2713845919. The cubic root of 5561172805 is about 1771.6943360595.

The spelling of 5561172805 in words is "five billion, five hundred sixty-one million, one hundred seventy-two thousand, eight hundred five".