6850505681 has 4 divisors (see below), whose sum is σ = 6862805172. Its totient is φ = 6838206192.

The previous prime is 6850505663. The next prime is 6850505719. The reversal of 6850505681 is 1865050586.

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 2363515456 + 4486990225 = 48616^2 + 66985^2 .

It is a cyclic number.

It is not a de Polignac number, because 6850505681 - 2⁶ = 6850505617 is a prime.

It is a super-2 number, since 2×6850505681² = 93858856170826547522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6850504681) 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, 6148910 + ... + 6150023.

It is an arithmetic number, because the mean of its divisors is an integer number (1715701293).

Almost surely, 2^6850505681 is an apocalyptic number.

It is an amenable number.

6850505681 is a deficient number, since it is larger than the sum of its proper divisors (12299491).

6850505681 is a wasteful number, since it uses less digits than its factorization.

6850505681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12299490.

The product of its (nonzero) digits is 288000, while the sum is 44.

The square root of 6850505681 is about 82767.7816604988. The cubic root of 6850505681 is about 1899.2153436820.

The spelling of 6850505681 in words is "six billion, eight hundred fifty million, five hundred five thousand, six hundred eighty-one".