855640473851 has 4 divisors (see below), whose sum is σ = 855693362832. Its totient is φ = 855587584872.

The previous prime is 855640473803. The next prime is 855640473871. The reversal of 855640473851 is 158374046558.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-855640473851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855640473871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26420216 + ... + 26452581.

It is an arithmetic number, because the mean of its divisors is an integer number (213923340708).

Almost surely, 2^855640473851 is an apocalyptic number.

855640473851 is a deficient number, since it is larger than the sum of its proper divisors (52888981).

855640473851 is a wasteful number, since it uses less digits than its factorization.

855640473851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52888980.

The product of its (nonzero) digits is 16128000, while the sum is 56.

The spelling of 855640473851 in words is "eight hundred fifty-five billion, six hundred forty million, four hundred seventy-three thousand, eight hundred fifty-one".