8820535681 has 4 divisors (see below), whose sum is σ = 8820866052. Its totient is φ = 8820205312.

The previous prime is 8820535643. The next prime is 8820535723. The reversal of 8820535681 is 1865350288.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2373248656 + 6447287025 = 48716^2 + 80295^2 .

It is a cyclic number.

It is not a de Polignac number, because 8820535681 - 2¹³ = 8820527489 is a prime.

It is a super-2 number, since 2×8820535681² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8820535181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 121240 + ... + 179833.

It is an arithmetic number, because the mean of its divisors is an integer number (2205216513).

Almost surely, 2^8820535681 is an apocalyptic number.

It is an amenable number.

8820535681 is a deficient number, since it is larger than the sum of its proper divisors (330371).

8820535681 is a wasteful number, since it uses less digits than its factorization.

8820535681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330370.

The product of its (nonzero) digits is 460800, while the sum is 46.

The square root of 8820535681 is about 93917.7069619995. The cubic root of 8820535681 is about 2066.1649359758.

The spelling of 8820535681 in words is "eight billion, eight hundred twenty million, five hundred thirty-five thousand, six hundred eighty-one".