11940209897 has 12 divisors (see below), whose sum is σ = 15152326416. Its totient is φ = 9304059240.

The previous prime is 11940209873. The next prime is 11940209909. The reversal of 11940209897 is 79890204911.

11940209897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 11940209897 - 2⁶ = 11940209833 is a prime.

It is a super-2 number, since 2×11940209897² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11940209797) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11075723 + ... + 11076800.

It is an arithmetic number, because the mean of its divisors is an integer number (1262693868).

Almost surely, 2^11940209897 is an apocalyptic number.

It is an amenable number.

11940209897 is a deficient number, since it is larger than the sum of its proper divisors (3212116519).

11940209897 is a wasteful number, since it uses less digits than its factorization.

11940209897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22152548 (or 22152541 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 50.

The spelling of 11940209897 in words is "eleven billion, nine hundred forty million, two hundred nine thousand, eight hundred ninety-seven".