6654877865 has 4 divisors (see below), whose sum is σ = 7985853444. Its totient is φ = 5323902288.

The previous prime is 6654877837. The next prime is 6654877877. The reversal of 6654877865 is 5687784566.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5687784566 = 2 ⋅2843892283.

It can be written as a sum of positive squares in 2 ways, for example, as 3043949584 + 3610928281 = 55172^2 + 60091^2 .

It is a cyclic number.

It is not a de Polignac number, because 6654877865 - 2¹⁰ = 6654876841 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6654877798 and 6654877807.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 665487782 + ... + 665487791.

It is an arithmetic number, because the mean of its divisors is an integer number (1996463361).

Almost surely, 2^6654877865 is an apocalyptic number.

It is an amenable number.

6654877865 is a deficient number, since it is larger than the sum of its proper divisors (1330975579).

6654877865 is a wasteful number, since it uses less digits than its factorization.

6654877865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330975578.

The product of its digits is 67737600, while the sum is 62.

The square root of 6654877865 is about 81577.4347782523. The cubic root of 6654877865 is about 1880.9620345019.

The spelling of 6654877865 in words is "six billion, six hundred fifty-four million, eight hundred seventy-seven thousand, eight hundred sixty-five".