11605549998397 has 4 divisors (see below), whose sum is σ = 11608004126620. Its totient is φ = 11603095870176.

The previous prime is 11605549998389. The next prime is 11605549998433. The reversal of 11605549998397 is 79389994550611.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4841082460516 + 6764467537881 = 2200246^2 + 2600859^2 .

It is a cyclic number.

It is not a de Polignac number, because 11605549998397 - 2³ = 11605549998389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11605549998307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1227057018 + ... + 1227066475.

It is an arithmetic number, because the mean of its divisors is an integer number (2902001031655).

Almost surely, 2^{11605549998397} is an apocalyptic number.

It is an amenable number.

11605549998397 is a deficient number, since it is larger than the sum of its proper divisors (2454128223).

11605549998397 is an equidigital number, since it uses as much as digits as its factorization.

11605549998397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2454128222.

The product of its (nonzero) digits is 661348800, while the sum is 76.

The spelling of 11605549998397 in words is "eleven trillion, six hundred five billion, five hundred forty-nine million, nine hundred ninety-eight thousand, three hundred ninety-seven".