865750665420 has 288 divisors, whose sum is σ = 2815308926976. Its totient is φ = 223094995200.

The previous prime is 865750665419. The next prime is 865750665469. The reversal of 865750665420 is 24566057568.

865750665420 is a `hidden beast` number, since 8 + 6 + 57 + 506 + 65 + 4 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 114045825 + ... + 114053415.

Almost surely, 2^865750665420 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 865750665420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1407654463488).

865750665420 is an abundant number, since it is smaller than the sum of its proper divisors (1949558261556).

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

865750665420 is a wasteful number, since it uses less digits than its factorization.

865750665420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8403 (or 8389 counting only the distinct ones).

The product of its (nonzero) digits is 12096000, while the sum is 54.

The spelling of 865750665420 in words is "eight hundred sixty-five billion, seven hundred fifty million, six hundred sixty-five thousand, four hundred twenty".