11956438617 has 16 divisors (see below), whose sum is σ = 17138012160. Its totient is φ = 7390764432.

The previous prime is 11956438603. The next prime is 11956438649. The reversal of 11956438617 is 71683465911.

It is a happy number.

It is not a de Polignac number, because 11956438617 - 2¹⁰ = 11956437593 is a prime.

It is a super-3 number, since 3×11956438617³ (a number of 31 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11956438617.

It is not an unprimeable number, because it can be changed into a prime (11956438817) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2228833 + ... + 2234190.

It is an arithmetic number, because the mean of its divisors is an integer number (1071125760).

Almost surely, 2^11956438617 is an apocalyptic number.

It is an amenable number.

11956438617 is a deficient number, since it is larger than the sum of its proper divisors (5181573543).

11956438617 is a wasteful number, since it uses less digits than its factorization.

11956438617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4463092.

The product of its digits is 1088640, while the sum is 51.

The spelling of 11956438617 in words is "eleven billion, nine hundred fifty-six million, four hundred thirty-eight thousand, six hundred seventeen".