16851001887720 has 1536 divisors, whose sum is σ = 77950978560000. Its totient is φ = 3038364794880.

The previous prime is 16851001887673. The next prime is 16851001887739. The reversal of 16851001887720 is 2778810015861.

16851001887720 is a `hidden beast` number, since 16 + 8 + 510 + 0 + 18 + 87 + 7 + 20 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 383 ways as a sum of consecutive naturals, for example, 9918187431 + ... + 9918189129.

It is an arithmetic number, because the mean of its divisors is an integer number (50749335000).

Almost surely, 2^{16851001887720} is an apocalyptic number.

16851001887720 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 16851001887720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38975489280000).

16851001887720 is an abundant number, since it is smaller than the sum of its proper divisors (61099976672280).

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

16851001887720 is a wasteful number, since it uses less digits than its factorization.

16851001887720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3383 (or 3376 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 54.

The spelling of 16851001887720 in words is "sixteen trillion, eight hundred fifty-one billion, one million, eight hundred eighty-seven thousand, seven hundred twenty".