16540640244 has 72 divisors (see below), whose sum is σ = 42499416960. Its totient is φ = 5423140800.

The previous prime is 16540640239. The next prime is 16540640351. The reversal of 16540640244 is 44204604561.

16540640244 is a `hidden beast` number, since 1 + 6 + 5 + 4 + 0 + 640 + 2 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 16540640199 and 16540640208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1114714 + ... + 1129454.

It is an arithmetic number, because the mean of its divisors is an integer number (590269680).

Almost surely, 2^16540640244 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 16540640244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21249708480).

16540640244 is an abundant number, since it is smaller than the sum of its proper divisors (25958776716).

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

16540640244 is a wasteful number, since it uses less digits than its factorization.

16540640244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15261 (or 15256 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The spelling of 16540640244 in words is "sixteen billion, five hundred forty million, six hundred forty thousand, two hundred forty-four".