11865398829409 has 6 divisors (see below), whose sum is σ = 12161857338470. Its totient is φ = 11575998856320.

The previous prime is 11865398829299. The next prime is 11865398829433. The reversal of 11865398829409 is 90492889356811.

It can be written as a sum of positive squares in 3 ways, for example, as 300910393809 + 11564488435600 = 548553^2 + 3400660^2 .

It is not a de Polignac number, because 11865398829409 - 2¹¹ = 11865398827361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11865398829469) 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 5 ways as a sum of consecutive naturals, for example, 3529266264 + ... + 3529269625.

Almost surely, 2^{11865398829409} is an apocalyptic number.

It is an amenable number.

11865398829409 is a deficient number, since it is larger than the sum of its proper divisors (296458509061).

11865398829409 is an frugal number, since it uses more digits than its factorization.

11865398829409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7058535971 (or 7058535930 counting only the distinct ones).

The product of its (nonzero) digits is 268738560, while the sum is 73.

The spelling of 11865398829409 in words is "eleven trillion, eight hundred sixty-five billion, three hundred ninety-eight million, eight hundred twenty-nine thousand, four hundred nine".