5618432781 has 32 divisors (see below), whose sum is σ = 9154629120. Its totient is φ = 3383923392.

The previous prime is 5618432779. The next prime is 5618432783. The reversal of 5618432781 is 1872348165.

5618432781 is a `hidden beast` number, since 5 + 618 + 4 + 3 + 27 + 8 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (5618432779) and next prime (5618432783).

It is not a de Polignac number, because 5618432781 - 2¹ = 5618432779 is a prime.

It is a super-2 number, since 2×5618432781² = 63133573829230787922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5618432783) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153790 + ... + 186783.

It is an arithmetic number, because the mean of its divisors is an integer number (286082160).

Almost surely, 2^5618432781 is an apocalyptic number.

It is an amenable number.

5618432781 is a deficient number, since it is larger than the sum of its proper divisors (3536196339).

5618432781 is a wasteful number, since it uses less digits than its factorization.

5618432781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340642 (or 340636 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 5618432781 is about 74956.2057537600. The cubic root of 5618432781 is about 1777.7542672454.

The spelling of 5618432781 in words is "five billion, six hundred eighteen million, four hundred thirty-two thousand, seven hundred eighty-one".