865055353280 has 56 divisors (see below), whose sum is σ = 2168329552080. Its totient is φ = 327810447360.

The previous prime is 865055353259. The next prime is 865055353297. The reversal of 865055353280 is 82353550568.

It is a congruent number.

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, 71133341 + ... + 71145500.

Almost surely, 2^865055353280 is an apocalyptic number.

865055353280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

865055353280 is an abundant number, since it is smaller than the sum of its proper divisors (1303274198800).

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

865055353280 is a wasteful number, since it uses less digits than its factorization.

865055353280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142278877 (or 142278867 counting only the distinct ones).

The product of its (nonzero) digits is 4320000, while the sum is 50.

The spelling of 865055353280 in words is "eight hundred sixty-five billion, fifty-five million, three hundred fifty-three thousand, two hundred eighty".