855636617 has 12 divisors (see below), whose sum is σ = 941229828. Its totient is φ = 777242400.

The previous prime is 855636583. The next prime is 855636637. The reversal of 855636617 is 716636558.

It can be written as a sum of positive squares in 2 ways, for example, as 149352841 + 706283776 = 12221^2 + 26576^2 .

It is not a de Polignac number, because 855636617 - 2²⁸ = 587201161 is a prime.

It is a super-2 number, since 2×855636617² = 1464228040702409378, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (855636637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 239867 + ... + 243407.

It is an arithmetic number, because the mean of its divisors is an integer number (78435819).

Almost surely, 2^855636617 is an apocalyptic number.

It is an amenable number.

855636617 is a deficient number, since it is larger than the sum of its proper divisors (85593211).

855636617 is a wasteful number, since it uses less digits than its factorization.

855636617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5560 (or 5549 counting only the distinct ones).

The product of its digits is 907200, while the sum is 47.

The square root of 855636617 is about 29251.2669298272. The cubic root of 855636617 is about 949.3575035200.

The spelling of 855636617 in words is "eight hundred fifty-five million, six hundred thirty-six thousand, six hundred seventeen".