11961854847 has 16 divisors (see below), whose sum is σ = 17756800000. Its totient is φ = 7958579832.

The previous prime is 11961854843. The next prime is 11961854867. The reversal of 11961854847 is 74845816911.

11961854847 is a `hidden beast` number, since 1 + 1 + 96 + 1 + 8 + 548 + 4 + 7 = 666.

It is not a de Polignac number, because 11961854847 - 2² = 11961854843 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11961854793 and 11961854802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11961854843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 430447 + ... + 457392.

It is an arithmetic number, because the mean of its divisors is an integer number (1109800000).

Almost surely, 2^11961854847 is an apocalyptic number.

11961854847 is a deficient number, since it is larger than the sum of its proper divisors (5794945153).

11961854847 is an equidigital number, since it uses as much as digits as its factorization.

11961854847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888347 (or 888341 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The spelling of 11961854847 in words is "eleven billion, nine hundred sixty-one million, eight hundred fifty-four thousand, eight hundred forty-seven".