855980859521 has 4 divisors (see below), whose sum is σ = 883593145344. Its totient is φ = 828368573700.

The previous prime is 855980859497. The next prime is 855980859529. The reversal of 855980859521 is 125958089558.

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 a cyclic number.

It is not a de Polignac number, because 855980859521 - 2¹⁰ = 855980858497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855980859529) 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, 13806142865 + ... + 13806142926.

It is an arithmetic number, because the mean of its divisors is an integer number (220898286336).

Almost surely, 2^855980859521 is an apocalyptic number.

It is an amenable number.

855980859521 is a deficient number, since it is larger than the sum of its proper divisors (27612285823).

855980859521 is a wasteful number, since it uses less digits than its factorization.

855980859521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27612285822.

The product of its (nonzero) digits is 51840000, while the sum is 65.

The spelling of 855980859521 in words is "eight hundred fifty-five billion, nine hundred eighty million, eight hundred fifty-nine thousand, five hundred twenty-one".