855817649643 has 8 divisors (see below), whose sum is σ = 1244825672256. Its totient is φ = 518677363400.

The previous prime is 855817649641. The next prime is 855817649653. The reversal of 855817649643 is 346946718558.

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

It is a cyclic number.

It is not a de Polignac number, because 855817649643 - 2¹ = 855817649641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (855817649641) 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, 12966934053 + ... + 12966934118.

It is an arithmetic number, because the mean of its divisors is an integer number (155603209032).

Almost surely, 2^855817649643 is an apocalyptic number.

855817649643 is a deficient number, since it is larger than the sum of its proper divisors (389008022613).

855817649643 is a wasteful number, since it uses less digits than its factorization.

855817649643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25933868185.

The product of its digits is 174182400, while the sum is 66.

The spelling of 855817649643 in words is "eight hundred fifty-five billion, eight hundred seventeen million, six hundred forty-nine thousand, six hundred forty-three".