5611991040 has 520 divisors, whose sum is σ = 21407997600. Its totient is φ = 1401421824.

The previous prime is 5611991009. The next prime is 5611991041. The reversal of 5611991040 is 401991165.

5611991040 is a `hidden beast` number, since 561 + 1 + 9 + 91 + 0 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 5611990986 and 5611991004.

It is not an unprimeable number, because it can be changed into a prime (5611991041) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 28200861 + ... + 28201059.

Almost surely, 2^5611991040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 5611991040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10703998800).

5611991040 is an abundant number, since it is smaller than the sum of its proper divisors (15796006560).

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

5611991040 is a wasteful number, since it uses less digits than its factorization.

5611991040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 5611991040 is about 74913.2233988099. The cubic root of 5611991040 is about 1777.0745870785.

The spelling of 5611991040 in words is "five billion, six hundred eleven million, nine hundred ninety-one thousand, forty".