6785507681 has 4 divisors (see below), whose sum is σ = 6785681172. Its totient is φ = 6785334192.

The previous prime is 6785507669. The next prime is 6785507689. The reversal of 6785507681 is 1867055876.

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 3042515281 + 3742992400 = 55159^2 + 61180^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6785507681 is a prime.

It is a super-2 number, since 2×6785507681² = 92086228977819995522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6785507689) 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, 2591 + ... + 116523.

It is an arithmetic number, because the mean of its divisors is an integer number (1696420293).

Almost surely, 2^6785507681 is an apocalyptic number.

It is an amenable number.

6785507681 is a deficient number, since it is larger than the sum of its proper divisors (173491).

6785507681 is a wasteful number, since it uses less digits than its factorization.

6785507681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173490.

The product of its (nonzero) digits is 2822400, while the sum is 53.

The square root of 6785507681 is about 82374.1930521932. The cubic root of 6785507681 is about 1893.1896236273.

The spelling of 6785507681 in words is "six billion, seven hundred eighty-five million, five hundred seven thousand, six hundred eighty-one".