865320553812 has 96 divisors (see below), whose sum is σ = 2448585990144. Its totient is φ = 234239702400.

The previous prime is 865320553759. The next prime is 865320553813. The reversal of 865320553812 is 218355023568.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865320553813) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8080128 + ... + 8186519.

It is an arithmetic number, because the mean of its divisors is an integer number (25506104064).

Almost surely, 2^865320553812 is an apocalyptic number.

It is an amenable number.

865320553812 is an abundant number, since it is smaller than the sum of its proper divisors (1583265436332).

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

865320553812 is a wasteful number, since it uses less digits than its factorization.

865320553812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16266709 (or 16266707 counting only the distinct ones).

The product of its (nonzero) digits is 1728000, while the sum is 48.

The spelling of 865320553812 in words is "eight hundred sixty-five billion, three hundred twenty million, five hundred fifty-three thousand, eight hundred twelve".