6881434561 has 4 divisors (see below), whose sum is σ = 7180627392. Its totient is φ = 6582241732.

The previous prime is 6881434541. The next prime is 6881434579. The reversal of 6881434561 is 1654341886.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1654341886 = 2 ⋅827170943.

It is a cyclic number.

It is not a de Polignac number, because 6881434561 - 2²³ = 6873045953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6881434531) 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, 149596381 + ... + 149596426.

It is an arithmetic number, because the mean of its divisors is an integer number (1795156848).

Almost surely, 2^6881434561 is an apocalyptic number.

It is an amenable number.

6881434561 is a deficient number, since it is larger than the sum of its proper divisors (299192831).

6881434561 is a wasteful number, since it uses less digits than its factorization.

6881434561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299192830.

The product of its digits is 552960, while the sum is 46.

The square root of 6881434561 is about 82954.4125468923. The cubic root of 6881434561 is about 1902.0692655161.

The spelling of 6881434561 in words is "six billion, eight hundred eighty-one million, four hundred thirty-four thousand, five hundred sixty-one".