855645897 has 4 divisors (see below), whose sum is σ = 1140861200. Its totient is φ = 570430596.

The previous prime is 855645883. The next prime is 855645913. The reversal of 855645897 is 798546558.

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 not a de Polignac number, because 855645897 - 2⁸ = 855645641 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855645997) 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, 142607647 + ... + 142607652.

It is an arithmetic number, because the mean of its divisors is an integer number (285215300).

Almost surely, 2^855645897 is an apocalyptic number.

It is an amenable number.

855645897 is a deficient number, since it is larger than the sum of its proper divisors (285215303).

855645897 is a wasteful number, since it uses less digits than its factorization.

855645897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285215302.

The product of its digits is 12096000, while the sum is 57.

The square root of 855645897 is about 29251.4255550050. The cubic root of 855645897 is about 949.3609356646.

The spelling of 855645897 in words is "eight hundred fifty-five million, six hundred forty-five thousand, eight hundred ninety-seven".