11955171606 has 24 divisors (see below), whose sum is σ = 27814073400. Its totient is φ = 3415763232.

The previous prime is 11955171601. The next prime is 11955171611. The reversal of 11955171606 is 60617155911.

It is an interprime number because it is at equal distance from previous prime (11955171601) and next prime (11955171611).

It is a super-2 number, since 2×11955171606² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11955171601) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20331631 + ... + 20332218.

It is an arithmetic number, because the mean of its divisors is an integer number (1158919725).

Almost surely, 2^11955171606 is an apocalyptic number.

11955171606 is an abundant number, since it is smaller than the sum of its proper divisors (15858901794).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11955171606 is a wasteful number, since it uses less digits than its factorization.

11955171606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40663868 (or 40663861 counting only the distinct ones).

The product of its (nonzero) digits is 56700, while the sum is 42.

The spelling of 11955171606 in words is "eleven billion, nine hundred fifty-five million, one hundred seventy-one thousand, six hundred six".