6861344557 has 4 divisors (see below), whose sum is σ = 6862011040. Its totient is φ = 6860678076.

The previous prime is 6861344489. The next prime is 6861344563. The reversal of 6861344557 is 7554431686.

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: 7554431686 = 2 ⋅3777215843.

It is a cyclic number.

It is not a de Polignac number, because 6861344557 - 2¹⁹ = 6860820269 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6861344557.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6861344587) 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, 317553 + ... + 338470.

It is an arithmetic number, because the mean of its divisors is an integer number (1715502760).

Almost surely, 2^6861344557 is an apocalyptic number.

It is an amenable number.

6861344557 is a deficient number, since it is larger than the sum of its proper divisors (666483).

6861344557 is a wasteful number, since it uses less digits than its factorization.

6861344557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 666482.

The product of its digits is 2419200, while the sum is 49.

The square root of 6861344557 is about 82833.2334090611. The cubic root of 6861344557 is about 1900.2164625956.

The spelling of 6861344557 in words is "six billion, eight hundred sixty-one million, three hundred forty-four thousand, five hundred fifty-seven".