11978417709 has 12 divisors (see below), whose sum is σ = 17308447936. Its totient is φ = 7982709192.

The previous prime is 11978417699. The next prime is 11978417749. The reversal of 11978417709 is 90771487911.

It is a happy number.

11978417709 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 11978417709 - 2¹¹ = 11978415661 is a prime.

It is a super-2 number, since 2×11978417709² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11978417749) 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, 215599 + ... + 265404.

Almost surely, 2^11978417709 is an apocalyptic number.

It is an amenable number.

11978417709 is a deficient number, since it is larger than the sum of its proper divisors (5330030227).

11978417709 is a wasteful number, since it uses less digits than its factorization.

11978417709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483776 (or 483773 counting only the distinct ones).

The product of its (nonzero) digits is 889056, while the sum is 54.

The spelling of 11978417709 in words is "eleven billion, nine hundred seventy-eight million, four hundred seventeen thousand, seven hundred nine".