11955256840 has 16 divisors (see below), whose sum is σ = 26899327980. Its totient is φ = 4782102720.

The previous prime is 11955256801. The next prime is 11955256843. The reversal of 11955256840 is 4865255911.

It can be written as a sum of positive squares in 2 ways, for example, as 10871398756 + 1083858084 = 104266^2 + 32922^2 .

It is a super-2 number, since 2×11955256840² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11955256843) 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, 149440671 + ... + 149440750.

Almost surely, 2^11955256840 is an apocalyptic number.

11955256840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11955256840 is an abundant number, since it is smaller than the sum of its proper divisors (14944071140).

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

11955256840 is a wasteful number, since it uses less digits than its factorization.

11955256840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298881432 (or 298881428 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 46.

The spelling of 11955256840 in words is "eleven billion, nine hundred fifty-five million, two hundred fifty-six thousand, eight hundred forty".