6800687557 has 4 divisors (see below), whose sum is σ = 6870797836. Its totient is φ = 6730577280.

The previous prime is 6800687521. The next prime is 6800687563. The reversal of 6800687557 is 7557860086.

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 4526732961 + 2273954596 = 67281^2 + 47686^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6800687557 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6800687057) 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, 35054994 + ... + 35055187.

It is an arithmetic number, because the mean of its divisors is an integer number (1717699459).

Almost surely, 2^6800687557 is an apocalyptic number.

It is an amenable number.

6800687557 is a deficient number, since it is larger than the sum of its proper divisors (70110279).

6800687557 is an equidigital number, since it uses as much as digits as its factorization.

6800687557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70110278.

The product of its (nonzero) digits is 2822400, while the sum is 52.

The square root of 6800687557 is about 82466.2813336457. The cubic root of 6800687557 is about 1894.6003252500.

The spelling of 6800687557 in words is "six billion, eight hundred million, six hundred eighty-seven thousand, five hundred fifty-seven".