799865557 has 4 divisors (see below), whose sum is σ = 800711136. Its totient is φ = 799019980.

The previous prime is 799865531. The next prime is 799865567. The reversal of 799865557 is 755568997.

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: 755568997 = 61 ⋅12386377.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-799865557 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 799865495 and 799865504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (799865567) 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, 421369 + ... + 423262.

It is an arithmetic number, because the mean of its divisors is an integer number (200177784).

Almost surely, 2^799865557 is an apocalyptic number.

It is an amenable number.

799865557 is a deficient number, since it is larger than the sum of its proper divisors (845579).

799865557 is an equidigital number, since it uses as much as digits as its factorization.

799865557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845578.

The product of its digits is 23814000, while the sum is 61.

The square root of 799865557 is about 28281.8945086782. The cubic root of 799865557 is about 928.2657613819.

The spelling of 799865557 in words is "seven hundred ninety-nine million, eight hundred sixty-five thousand, five hundred fifty-seven".