865827601812 has 30 divisors (see below), whose sum is σ = 2263444379658. Its totient is φ = 288609200496.

The previous prime is 865827601811. The next prime is 865827601831. The reversal of 865827601812 is 218106728568.

865827601812 is a `hidden beast` number, since 8 + 6 + 5 + 8 + 27 + 601 + 8 + 1 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 795260867076 + 70566734736 = 891774^2 + 265644^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865827601811) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1336153383 + ... + 1336154030.

Almost surely, 2^865827601812 is an apocalyptic number.

It is an amenable number.

865827601812 is an abundant number, since it is smaller than the sum of its proper divisors (1397616777846).

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

865827601812 is a wasteful number, since it uses less digits than its factorization.

865827601812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2672307429 (or 2672307418 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 54.

The spelling of 865827601812 in words is "eight hundred sixty-five billion, eight hundred twenty-seven million, six hundred one thousand, eight hundred twelve".