855217132385 has 72 divisors (see below), whose sum is σ = 1312781816808. Its totient is φ = 532889280000.

The previous prime is 855217132381. The next prime is 855217132411. The reversal of 855217132385 is 583231712558.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 357306258001 + 497910874384 = 597751^2 + 705628^2 .

It is not a de Polignac number, because 855217132385 - 2² = 855217132381 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855217132381) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 88959839 + ... + 88969451.

It is an arithmetic number, because the mean of its divisors is an integer number (18233080789).

Almost surely, 2^855217132385 is an apocalyptic number.

It is an amenable number.

855217132385 is a deficient number, since it is larger than the sum of its proper divisors (457564684423).

855217132385 is a wasteful number, since it uses less digits than its factorization.

855217132385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12655 (or 12637 counting only the distinct ones).

The product of its digits is 2016000, while the sum is 50.

The spelling of 855217132385 in words is "eight hundred fifty-five billion, two hundred seventeen million, one hundred thirty-two thousand, three hundred eighty-five".