5618735681 has 8 divisors (see below), whose sum is σ = 6150142824. Its totient is φ = 5101499520.

The previous prime is 5618735663. The next prime is 5618735741. The reversal of 5618735681 is 1865378165.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 11122225 + 5607613456 = 3335^2 + 74884^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-5618735681 is a prime.

It is a super-2 number, since 2×5618735681² = 63140381305885067522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5618735641) 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, 3541916 + ... + 3543501.

It is an arithmetic number, because the mean of its divisors is an integer number (768767853).

Almost surely, 2^5618735681 is an apocalyptic number.

It is an amenable number.

5618735681 is a deficient number, since it is larger than the sum of its proper divisors (531407143).

5618735681 is a wasteful number, since it uses less digits than its factorization.

5618735681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7085491.

The product of its digits is 1209600, while the sum is 50.

The square root of 5618735681 is about 74958.2262396863. The cubic root of 5618735681 is about 1777.7862140006.

The spelling of 5618735681 in words is "five billion, six hundred eighteen million, seven hundred thirty-five thousand, six hundred eighty-one".