16251387840 has 252 divisors, whose sum is σ = 58439496024. Its totient is φ = 4144892928.

The previous prime is 16251387839. The next prime is 16251387851. The reversal of 16251387840 is 4878315261.

16251387840 is a `hidden beast` number, since 1 + 62 + 513 + 8 + 78 + 4 + 0 = 666.

16251387840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1518187 + ... + 1528853.

It is an arithmetic number, because the mean of its divisors is an integer number (231902762).

Almost surely, 2^16251387840 is an apocalyptic number.

16251387840 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 16251387840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29219748012).

16251387840 is an abundant number, since it is smaller than the sum of its proper divisors (42188108184).

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

16251387840 is a wasteful number, since it uses less digits than its factorization.

16251387840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10736 (or 10700 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The spelling of 16251387840 in words is "sixteen billion, two hundred fifty-one million, three hundred eighty-seven thousand, eight hundred forty".