11958173440 has 36 divisors (see below), whose sum is σ = 28643565384. Its totient is φ = 4783268864.

The previous prime is 11958173419. The next prime is 11958173441. The reversal of 11958173440 is 4437185911.

It is a happy number.

It is a super-2 number, since 2×11958173440² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11958173441) 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, 4669882 + ... + 4672441.

It is an arithmetic number, because the mean of its divisors is an integer number (795654594).

Almost surely, 2^11958173440 is an apocalyptic number.

11958173440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11958173440 is an abundant number, since it is smaller than the sum of its proper divisors (16685391944).

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

11958173440 is an frugal number, since it uses more digits than its factorization.

11958173440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9342344 (or 9342330 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 43.

The spelling of 11958173440 in words is "eleven billion, nine hundred fifty-eight million, one hundred seventy-three thousand, four hundred forty".