11956291385 has 8 divisors (see below), whose sum is σ = 14355801096. Its totient is φ = 9559532160.

The previous prime is 11956291357. The next prime is 11956291421. The reversal of 11956291385 is 58319265911.

It can be written as a sum of positive squares in 4 ways, for example, as 121462441 + 11834828944 = 11021^2 + 108788^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11956291385 - 2¹⁰ = 11956290361 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 678044 + ... + 695453.

It is an arithmetic number, because the mean of its divisors is an integer number (1794475137).

Almost surely, 2^11956291385 is an apocalyptic number.

It is an amenable number.

11956291385 is a deficient number, since it is larger than the sum of its proper divisors (2399509711).

11956291385 is a wasteful number, since it uses less digits than its factorization.

11956291385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1375243.

The product of its digits is 583200, while the sum is 50.

The spelling of 11956291385 in words is "eleven billion, nine hundred fifty-six million, two hundred ninety-one thousand, three hundred eighty-five".