11981064648 has 64 divisors (see below), whose sum is σ = 34564008960. Its totient is φ = 3389921856.

The previous prime is 11981064607. The next prime is 11981064659. The reversal of 11981064648 is 84646018911.

It is a junction number, because it is equal to n+sod(n) for n = 11981064597 and 11981064606.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 328890 + ... + 363497.

It is an arithmetic number, because the mean of its divisors is an integer number (540062640).

Almost surely, 2^11981064648 is an apocalyptic number.

It is an amenable number.

11981064648 is an abundant number, since it is smaller than the sum of its proper divisors (22582944312).

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

11981064648 is a wasteful number, since it uses less digits than its factorization.

11981064648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692506 (or 692502 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 48.

The spelling of 11981064648 in words is "eleven billion, nine hundred eighty-one million, sixty-four thousand, six hundred forty-eight".