16778038852 has 6 divisors (see below), whose sum is σ = 29361567998. Its totient is φ = 8389019424.

The previous prime is 16778038841. The next prime is 16778038861. The reversal of 16778038852 is 25883087761.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11987184196 + 4790854656 = 109486^2 + 69216^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16778038793 and 16778038802.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2097254853 + ... + 2097254860.

Almost surely, 2^16778038852 is an apocalyptic number.

It is an amenable number.

16778038852 is a deficient number, since it is larger than the sum of its proper divisors (12583529146).

16778038852 is a wasteful number, since it uses less digits than its factorization.

16778038852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4194509717 (or 4194509715 counting only the distinct ones).

The product of its (nonzero) digits is 4515840, while the sum is 55.

The spelling of 16778038852 in words is "sixteen billion, seven hundred seventy-eight million, thirty-eight thousand, eight hundred fifty-two".