16628813781388 has 12 divisors (see below), whose sum is σ = 30103887018240. Its totient is φ = 8027703204752.

The previous prime is 16628813781353. The next prime is 16628813781407. The reversal of 16628813781388 is 88318731882661.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71675921356 + ... + 71675921587.

It is an arithmetic number, because the mean of its divisors is an integer number (2508657251520).

Almost surely, 2^{16628813781388} is an apocalyptic number.

It is an amenable number.

16628813781388 is a deficient number, since it is larger than the sum of its proper divisors (13475073236852).

16628813781388 is a wasteful number, since it uses less digits than its factorization.

16628813781388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143351842976 (or 143351842974 counting only the distinct ones).

The product of its digits is 148635648, while the sum is 70.

The spelling of 16628813781388 in words is "sixteen trillion, six hundred twenty-eight billion, eight hundred thirteen million, seven hundred eighty-one thousand, three hundred eighty-eight".