11961776646 has 48 divisors (see below), whose sum is σ = 26112821904. Its totient is φ = 3957276672.

The previous prime is 11961776641. The next prime is 11961776663. The reversal of 11961776646 is 64667716911.

11961776646 is a `hidden beast` number, since 1 + 19 + 617 + 7 + 6 + 6 + 4 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 11961776592 and 11961776601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11961776641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1304590 + ... + 1313726.

It is an arithmetic number, because the mean of its divisors is an integer number (544017123).

Almost surely, 2^11961776646 is an apocalyptic number.

11961776646 is an abundant number, since it is smaller than the sum of its proper divisors (14151045258).

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

11961776646 is a wasteful number, since it uses less digits than its factorization.

11961776646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9685 (or 9682 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 54.

The spelling of 11961776646 in words is "eleven billion, nine hundred sixty-one million, seven hundred seventy-six thousand, six hundred forty-six".