865981948608 has 840 divisors, whose sum is σ = 3264304855680. Its totient is φ = 225322352640.

The previous prime is 865981948553. The next prime is 865981948613. The reversal of 865981948608 is 806849189568.

865981948608 is a `hidden beast` number, since 8 + 6 + 5 + 9 + 8 + 1 + 9 + 4 + 8 + 608 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 133863198 + ... + 133869666.

Almost surely, 2^865981948608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 865981948608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1632152427840).

865981948608 is an abundant number, since it is smaller than the sum of its proper divisors (2398322907072).

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

865981948608 is a wasteful number, since it uses less digits than its factorization.

865981948608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6555 (or 6529 counting only the distinct ones).

The product of its (nonzero) digits is 238878720, while the sum is 72.

The spelling of 865981948608 in words is "eight hundred sixty-five billion, nine hundred eighty-one million, nine hundred forty-eight thousand, six hundred eight".