11961966648 has 32 divisors (see below), whose sum is σ = 31478860800. Its totient is φ = 3777463008.

The previous prime is 11961966647. The next prime is 11961966677. The reversal of 11961966648 is 84666916911.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11961966641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13115736 + ... + 13116647.

It is an arithmetic number, because the mean of its divisors is an integer number (983714400).

Almost surely, 2^11961966648 is an apocalyptic number.

It is an amenable number.

11961966648 is an abundant number, since it is smaller than the sum of its proper divisors (19516894152).

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

11961966648 is a wasteful number, since it uses less digits than its factorization.

11961966648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26232411 (or 26232407 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 57.

The spelling of 11961966648 in words is "eleven billion, nine hundred sixty-one million, nine hundred sixty-six thousand, six hundred forty-eight".