16391732797440 has 5376 divisors, whose sum is σ = 84548987965440. Its totient is φ = 2914957393920.

The previous prime is 16391732797411. The next prime is 16391732797477. The reversal of 16391732797440 is 4479723719361.

16391732797440 is a `hidden beast` number, since 1 + 6 + 3 + 91 + 7 + 32 + 79 + 7 + 440 = 666.

It is a tau number, because it is divible by the number of its divisors (5376).

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 244652728287 + ... + 244652728353.

Almost surely, 2^{16391732797440} is an apocalyptic number.

16391732797440 is a gapful number since it is divisible by the number (10) 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 16391732797440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42274493982720).

16391732797440 is an abundant number, since it is smaller than the sum of its proper divisors (68157255168000).

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

16391732797440 is a wasteful number, since it uses less digits than its factorization.

16391732797440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 48009024, while the sum is 63.

The spelling of 16391732797440 in words is "sixteen trillion, three hundred ninety-one billion, seven hundred thirty-two million, seven hundred ninety-seven thousand, four hundred forty".