6840688961 has 4 divisors (see below), whose sum is σ = 6842438400. Its totient is φ = 6838939524.

The previous prime is 6840688951. The next prime is 6840689017. The reversal of 6840688961 is 1698860486.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6840688961 - 2²² = 6836494657 is a prime.

It is a super-2 number, since 2×6840688961² = 93590050922294519042, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6840688897 and 6840688906.

It is not an unprimeable number, because it can be changed into a prime (6840688951) 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, 868841 + ... + 876678.

It is an arithmetic number, because the mean of its divisors is an integer number (1710609600).

Almost surely, 2^6840688961 is an apocalyptic number.

It is an amenable number.

6840688961 is a deficient number, since it is larger than the sum of its proper divisors (1749439).

6840688961 is a wasteful number, since it uses less digits than its factorization.

6840688961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749438.

The product of its (nonzero) digits is 3981312, while the sum is 56.

The square root of 6840688961 is about 82708.4576146841. The cubic root of 6840688961 is about 1898.3077231932.

The spelling of 6840688961 in words is "six billion, eight hundred forty million, six hundred eighty-eight thousand, nine hundred sixty-one".