11957321896 has 32 divisors (see below), whose sum is σ = 24287495400. Its totient is φ = 5518755840.

The previous prime is 11957321869. The next prime is 11957321917. The reversal of 11957321896 is 69812375911.

It can be written as a sum of positive squares in 4 ways, for example, as 2589792100 + 9367529796 = 50890^2 + 96786^2 .

It is a super-2 number, since 2×11957321896² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 322585 + ... + 357736.

Almost surely, 2^11957321896 is an apocalyptic number.

It is an amenable number.

11957321896 is an abundant number, since it is smaller than the sum of its proper divisors (12330173504).

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

11957321896 is an equidigital number, since it uses as much as digits as its factorization.

11957321896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 680366 (or 680336 counting only the distinct ones).

The product of its digits is 816480, while the sum is 52.

The spelling of 11957321896 in words is "eleven billion, nine hundred fifty-seven million, three hundred twenty-one thousand, eight hundred ninety-six".