855568813 has 4 divisors (see below), whose sum is σ = 933347808. Its totient is φ = 777789820.

The previous prime is 855568811. The next prime is 855568873. The reversal of 855568813 is 318865558.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 855568813 - 2¹ = 855568811 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855568811) 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, 38889481 + ... + 38889502.

It is an arithmetic number, because the mean of its divisors is an integer number (233336952).

Almost surely, 2^855568813 is an apocalyptic number.

It is an amenable number.

855568813 is a deficient number, since it is larger than the sum of its proper divisors (77778995).

855568813 is a wasteful number, since it uses less digits than its factorization.

855568813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77778994.

The product of its digits is 1152000, while the sum is 49.

The square root of 855568813 is about 29250.1079143308. The cubic root of 855568813 is about 949.3324259207.

The spelling of 855568813 in words is "eight hundred fifty-five million, five hundred sixty-eight thousand, eight hundred thirteen".