869391809444 has 6 divisors (see below), whose sum is σ = 1521435666534. Its totient is φ = 434695904720.

The previous prime is 869391809443. The next prime is 869391809459. The reversal of 869391809444 is 444908193968.

It can be written as a sum of positive squares in only one way, i.e., 848355207844 + 21036601600 = 921062^2 + 145040^2 .

It is not an unprimeable number, because it can be changed into a prime (869391809443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 108673976177 + ... + 108673976184.

It is an arithmetic number, because the mean of its divisors is an integer number (253572611089).

Almost surely, 2^869391809444 is an apocalyptic number.

It is an amenable number.

869391809444 is a deficient number, since it is larger than the sum of its proper divisors (652043857090).

869391809444 is a wasteful number, since it uses less digits than its factorization.

869391809444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217347952365 (or 217347952363 counting only the distinct ones).

The product of its (nonzero) digits is 53747712, while the sum is 65.

The spelling of 869391809444 in words is "eight hundred sixty-nine billion, three hundred ninety-one million, eight hundred nine thousand, four hundred forty-four".