5561917638 has 48 divisors (see below), whose sum is σ = 12003833856. Its totient is φ = 1716129360.

The previous prime is 5561917609. The next prime is 5561917657. The reversal of 5561917638 is 8367191655.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70131 + ... + 126657.

It is an arithmetic number, because the mean of its divisors is an integer number (250079872).

Almost surely, 2^5561917638 is an apocalyptic number.

5561917638 is an abundant number, since it is smaller than the sum of its proper divisors (6441916218).

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

5561917638 is a wasteful number, since it uses less digits than its factorization.

5561917638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56609 (or 56586 counting only the distinct ones).

The product of its digits is 1360800, while the sum is 51.

The square root of 5561917638 is about 74578.2651849720. The cubic root of 5561917638 is about 1771.7734295376.

The spelling of 5561917638 in words is "five billion, five hundred sixty-one million, nine hundred seventeen thousand, six hundred thirty-eight".