865400807144 has 16 divisors (see below), whose sum is σ = 1718075132100. Its totient is φ = 407247438592.

The previous prime is 865400807137. The next prime is 865400807153. The reversal of 865400807144 is 441708004568.

It can be written as a sum of positive squares in 2 ways, for example, as 829429132900 + 35971674244 = 910730^2 + 189662^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3181620479 + ... + 3181620750.

Almost surely, 2^865400807144 is an apocalyptic number.

It is an amenable number.

865400807144 is a deficient number, since it is larger than the sum of its proper divisors (852674324956).

865400807144 is a wasteful number, since it uses less digits than its factorization.

865400807144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6363241252 (or 6363241248 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 47.

The spelling of 865400807144 in words is "eight hundred sixty-five billion, four hundred million, eight hundred seven thousand, one hundred forty-four".