865945549504 has 56 divisors (see below), whose sum is σ = 1972057950720. Its totient is φ = 369566674176.

The previous prime is 865945549351. The next prime is 865945549537. The reversal of 865945549504 is 405945549568.

It is a tau number, because it is divible by the number of its divisors (56).

It is a Harshad number since it is a multiple of its sum of digits (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3936682 + ... + 4150825.

Almost surely, 2^865945549504 is an apocalyptic number.

It is an amenable number.

865945549504 is an abundant number, since it is smaller than the sum of its proper divisors (1106112401216).

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

865945549504 is a wasteful number, since it uses less digits than its factorization.

865945549504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8087765 (or 8087755 counting only the distinct ones).

The product of its (nonzero) digits is 155520000, while the sum is 64.

Adding to 865945549504 its sum of digits (64), we get a palindrome (865945549568).

The spelling of 865945549504 in words is "eight hundred sixty-five billion, nine hundred forty-five million, five hundred forty-nine thousand, five hundred four".