16851001887721 has 8 divisors (see below), whose sum is σ = 16910226883584. Its totient is φ = 16791841799040.

The previous prime is 16851001887673. The next prime is 16851001887739. The reversal of 16851001887721 is 12778810015861.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16851001887721 - 2¹³ = 16851001879529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16851001887751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15706621 + ... + 16745146.

It is an arithmetic number, because the mean of its divisors is an integer number (2113778360448).

Almost surely, 2^{16851001887721} is an apocalyptic number.

It is an amenable number.

16851001887721 is a deficient number, since it is larger than the sum of its proper divisors (59224995863).

16851001887721 is a wasteful number, since it uses less digits than its factorization.

16851001887721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32453591.

The product of its (nonzero) digits is 1505280, while the sum is 55.

The spelling of 16851001887721 in words is "sixteen trillion, eight hundred fifty-one billion, one million, eight hundred eighty-seven thousand, seven hundred twenty-one".