5661912497 has 4 divisors (see below), whose sum is σ = 5670478836. Its totient is φ = 5653346160.

The previous prime is 5661912493. The next prime is 5661912499. The reversal of 5661912497 is 7942191665.

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 1943839921 + 3718072576 = 44089^2 + 60976^2 .

It is a cyclic number.

It is not a de Polignac number, because 5661912497 - 2² = 5661912493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5661912493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4282178 + ... + 4283499.

It is an arithmetic number, because the mean of its divisors is an integer number (1417619709).

Almost surely, 2^5661912497 is an apocalyptic number.

It is an amenable number.

5661912497 is a deficient number, since it is larger than the sum of its proper divisors (8566339).

5661912497 is an equidigital number, since it uses as much as digits as its factorization.

5661912497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8566338.

The product of its digits is 816480, while the sum is 50.

The square root of 5661912497 is about 75245.6809192395. The cubic root of 5661912497 is about 1782.3283607739.

The spelling of 5661912497 in words is "five billion, six hundred sixty-one million, nine hundred twelve thousand, four hundred ninety-seven".