16721887038717 has 48 divisors (see below), whose sum is σ = 26043905064960. Its totient is φ = 9348735367392.

The previous prime is 16721887038643. The next prime is 16721887038719. The reversal of 16721887038717 is 71783078812761.

It is a happy number.

It is not a de Polignac number, because 16721887038717 - 2⁷ = 16721887038589 is a prime.

It is a super-2 number, since 2×16721887038717² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16721887038719) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 133491328 + ... + 133616534.

It is an arithmetic number, because the mean of its divisors is an integer number (542581355520).

Almost surely, 2^{16721887038717} is an apocalyptic number.

It is an amenable number.

16721887038717 is a deficient number, since it is larger than the sum of its proper divisors (9322018026243).

16721887038717 is a wasteful number, since it uses less digits than its factorization.

16721887038717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128190 (or 128143 counting only the distinct ones).

The product of its (nonzero) digits is 44255232, while the sum is 66.

The spelling of 16721887038717 in words is "sixteen trillion, seven hundred twenty-one billion, eight hundred eighty-seven million, thirty-eight thousand, seven hundred seventeen".