11656520016 has 80 divisors (see below), whose sum is σ = 31960686528. Its totient is φ = 3648153600.

The previous prime is 11656520009. The next prime is 11656520021. The reversal of 11656520016 is 61002565611.

It is a congruent number.

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, 326571 + ... + 360501.

Almost surely, 2^11656520016 is an apocalyptic number.

11656520016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 11656520016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15980343264).

11656520016 is an abundant number, since it is smaller than the sum of its proper divisors (20304166512).

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

11656520016 is a wasteful number, since it uses less digits than its factorization.

11656520016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34380 (or 34374 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 33.

The spelling of 11656520016 in words is "eleven billion, six hundred fifty-six million, five hundred twenty thousand, sixteen".