16721887038718 has 8 divisors (see below), whose sum is σ = 25088587475112. Its totient is φ = 8359024547016.

The previous prime is 16721887038643. The next prime is 16721887038719. The reversal of 16721887038718 is 81783078812761.

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

It is a super-2 number, since 2×16721887038718² (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 3 ways as a sum of consecutive naturals, for example, 959475280 + ... + 959492707.

It is an arithmetic number, because the mean of its divisors is an integer number (3136073434389).

Almost surely, 2^{16721887038718} is an apocalyptic number.

16721887038718 is a deficient number, since it is larger than the sum of its proper divisors (8366700436394).

16721887038718 is a wasteful number, since it uses less digits than its factorization.

16721887038718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1918972346.

The product of its (nonzero) digits is 50577408, while the sum is 67.

The spelling of 16721887038718 in words is "sixteen trillion, seven hundred twenty-one billion, eight hundred eighty-seven million, thirty-eight thousand, seven hundred eighteen".