865396671249 has 16 divisors (see below), whose sum is σ = 1258774605504. Its totient is φ = 524476243200.

The previous prime is 865396671241. The next prime is 865396671263. The reversal of 865396671249 is 942176693568.

It is not a de Polignac number, because 865396671249 - 2³ = 865396671241 is a prime.

It is a super-2 number, since 2×865396671249² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 865396671249.

It is not an unprimeable number, because it can be changed into a prime (865396671241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4347117 + ... + 4541829.

It is an arithmetic number, because the mean of its divisors is an integer number (78673412844).

Almost surely, 2^865396671249 is an apocalyptic number.

It is an amenable number.

865396671249 is a deficient number, since it is larger than the sum of its proper divisors (393377934255).

865396671249 is a wasteful number, since it uses less digits than its factorization.

865396671249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329408.

The product of its digits is 117573120, while the sum is 66.

The spelling of 865396671249 in words is "eight hundred sixty-five billion, three hundred ninety-six million, six hundred seventy-one thousand, two hundred forty-nine".