855615813 has 8 divisors (see below), whose sum is σ = 1228576608. Its totient is φ = 526532784.

The previous prime is 855615811. The next prime is 855615821. The reversal of 855615813 is 318516558.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 855615813 - 2¹ = 855615811 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (855615811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10969395 + ... + 10969472.

It is an arithmetic number, because the mean of its divisors is an integer number (153572076).

Almost surely, 2^855615813 is an apocalyptic number.

It is an amenable number.

855615813 is a deficient number, since it is larger than the sum of its proper divisors (372960795).

855615813 is a wasteful number, since it uses less digits than its factorization.

855615813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21938883.

The product of its digits is 144000, while the sum is 42.

The square root of 855615813 is about 29250.9113191367. The cubic root of 855615813 is about 949.3498092125.

The spelling of 855615813 in words is "eight hundred fifty-five million, six hundred fifteen thousand, eight hundred thirteen".