6878997581 has 4 divisors (see below), whose sum is σ = 6925165500. Its totient is φ = 6832829664.

The previous prime is 6878997563. The next prime is 6878997599. The reversal of 6878997581 is 1857998786.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (6878997563) and next prime (6878997599).

It can be written as a sum of positive squares in 2 ways, for example, as 3043177225 + 3835820356 = 55165^2 + 61934^2 .

It is a cyclic number.

It is not a de Polignac number, because 6878997581 - 2²² = 6874803277 is a prime.

It is a super-2 number, since 2×6878997581² = 94641215438807703122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6878997551) 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, 23083736 + ... + 23084033.

It is an arithmetic number, because the mean of its divisors is an integer number (1731291375).

Almost surely, 2^6878997581 is an apocalyptic number.

It is an amenable number.

6878997581 is a deficient number, since it is larger than the sum of its proper divisors (46167919).

6878997581 is a wasteful number, since it uses less digits than its factorization.

6878997581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46167918.

The product of its digits is 60963840, while the sum is 68.

The square root of 6878997581 is about 82939.7225760974. The cubic root of 6878997581 is about 1901.8447071043.

The spelling of 6878997581 in words is "six billion, eight hundred seventy-eight million, nine hundred ninety-seven thousand, five hundred eighty-one".