5656878857 has 4 divisors (see below), whose sum is σ = 6465004416. Its totient is φ = 4848753300.

The previous prime is 5656878847. The next prime is 5656878991. The reversal of 5656878857 is 7588786565.

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: 7588786565 = 5 ⋅1517757313.

It is a cyclic number.

It is not a de Polignac number, because 5656878857 - 2¹⁶ = 5656813321 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5656878793 and 5656878802.

It is not an unprimeable number, because it can be changed into a prime (5656878827) 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, 404062769 + ... + 404062782.

It is an arithmetic number, because the mean of its divisors is an integer number (1616251104).

Almost surely, 2^5656878857 is an apocalyptic number.

It is an amenable number.

5656878857 is a deficient number, since it is larger than the sum of its proper divisors (808125559).

5656878857 is an equidigital number, since it uses as much as digits as its factorization.

5656878857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 808125558.

The product of its digits is 112896000, while the sum is 65.

The square root of 5656878857 is about 75212.2254490585. The cubic root of 5656878857 is about 1781.8000199033.

The spelling of 5656878857 in words is "five billion, six hundred fifty-six million, eight hundred seventy-eight thousand, eight hundred fifty-seven".