16783686634 has 24 divisors (see below), whose sum is σ = 29800918980. Its totient is φ = 7042104960.

The previous prime is 16783686629. The next prime is 16783686643. The reversal of 16783686634 is 43668638761.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16487330409 + 296356225 = 128403^2 + 17215^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2664319 + ... + 2670610.

Almost surely, 2^16783686634 is an apocalyptic number.

16783686634 is a deficient number, since it is larger than the sum of its proper divisors (13017232346).

16783686634 is a wasteful number, since it uses less digits than its factorization.

16783686634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5334966 (or 5334955 counting only the distinct ones).

The product of its digits is 20901888, while the sum is 58.

The spelling of 16783686634 in words is "sixteen billion, seven hundred eighty-three million, six hundred eighty-six thousand, six hundred thirty-four".