861603536528 has 20 divisors (see below), whose sum is σ = 1907836402560. Its totient is φ = 369258658464.

The previous prime is 861603536527. The next prime is 861603536531. The reversal of 861603536528 is 825635306168.

It is a self number, because there is not a number n which added to its sum of digits gives 861603536528.

It is not an unprimeable number, because it can be changed into a prime (861603536527) 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, 3846444248 + ... + 3846444471.

It is an arithmetic number, because the mean of its divisors is an integer number (95391820128).

Almost surely, 2^861603536528 is an apocalyptic number.

It is an amenable number.

861603536528 is an abundant number, since it is smaller than the sum of its proper divisors (1046232866032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861603536528 is a wasteful number, since it uses less digits than its factorization.

861603536528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7692888734 (or 7692888728 counting only the distinct ones).

The product of its (nonzero) digits is 6220800, while the sum is 53.

The spelling of 861603536528 in words is "eight hundred sixty-one billion, six hundred three million, five hundred thirty-six thousand, five hundred twenty-eight".