16661327256 has 96 divisors (see below), whose sum is σ = 51802383360. Its totient is φ = 4739000256.

The previous prime is 16661327191. The next prime is 16661327257. The reversal of 16661327256 is 65272316661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16661327257) 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, 38271 + ... + 186513.

It is an arithmetic number, because the mean of its divisors is an integer number (539608160).

Almost surely, 2^16661327256 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 16661327256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25901191680).

16661327256 is an abundant number, since it is smaller than the sum of its proper divisors (35141056104).

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

16661327256 is a wasteful number, since it uses less digits than its factorization.

16661327256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148485 (or 148478 counting only the distinct ones).

The product of its digits is 544320, while the sum is 45.

The spelling of 16661327256 in words is "sixteen billion, six hundred sixty-one million, three hundred twenty-seven thousand, two hundred fifty-six".