5681532661 has 8 divisors (see below), whose sum is σ = 6494543744. Its totient is φ = 4868862480.

The previous prime is 5681532641. The next prime is 5681532697. The reversal of 5681532661 is 1662351865.

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

It is a cyclic number.

It is not a de Polignac number, because 5681532661 - 2⁹ = 5681532149 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 (5681532601) 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, 48450 + ... + 117091.

It is an arithmetic number, because the mean of its divisors is an integer number (811817968).

Almost surely, 2^5681532661 is an apocalyptic number.

It is an amenable number.

5681532661 is a deficient number, since it is larger than the sum of its proper divisors (813011083).

5681532661 is a wasteful number, since it uses less digits than its factorization.

5681532661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170451.

The product of its digits is 259200, while the sum is 43.

The square root of 5681532661 is about 75375.9421897995. The cubic root of 5681532661 is about 1784.3847483234.

The spelling of 5681532661 in words is "five billion, six hundred eighty-one million, five hundred thirty-two thousand, six hundred sixty-one".