5561663620 has 24 divisors (see below), whose sum is σ = 11685794904. Its totient is φ = 2223465216.

The previous prime is 5561663617. The next prime is 5561663647. The reversal of 5561663620 is 263661655.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1005143616 + 4556520004 = 31704^2 + 67502^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36537 + ... + 111616.

It is an arithmetic number, because the mean of its divisors is an integer number (486908121).

Almost surely, 2^5561663620 is an apocalyptic number.

It is an amenable number.

5561663620 is an abundant number, since it is smaller than the sum of its proper divisors (6124131284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

5561663620 is a wasteful number, since it uses less digits than its factorization.

5561663620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150039 (or 150037 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 5561663620 is about 74576.5621358346. The cubic root of 5561663620 is about 1771.7464562750.

The spelling of 5561663620 in words is "five billion, five hundred sixty-one million, six hundred sixty-three thousand, six hundred twenty".