16591444650 has 288 divisors, whose sum is σ = 51619696128. Its totient is φ = 3927268800.

The previous prime is 16591444643. The next prime is 16591444691. The reversal of 16591444650 is 5644419561.

16591444650 is a `hidden beast` number, since 1 + 6 + 591 + 4 + 4 + 4 + 6 + 50 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 16591444596 and 16591444605.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 5745507 + ... + 5748393.

It is an arithmetic number, because the mean of its divisors is an integer number (179235056).

Almost surely, 2^16591444650 is an apocalyptic number.

16591444650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16591444650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25809848064).

16591444650 is an abundant number, since it is smaller than the sum of its proper divisors (35028251478).

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

16591444650 is a wasteful number, since it uses less digits than its factorization.

16591444650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2968 (or 2951 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 16591444650 in words is "sixteen billion, five hundred ninety-one million, four hundred forty-four thousand, six hundred fifty".