16783961636 has 12 divisors (see below), whose sum is σ = 31631312412. Its totient is φ = 7746443808.

The previous prime is 16783961633. The next prime is 16783961683. The reversal of 16783961636 is 63616938761.

It can be written as a sum of positive squares in 2 ways, for example, as 9300673600 + 7483288036 = 96440^2 + 86506^2 .

It is not an unprimeable number, because it can be changed into a prime (16783961633) 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, 161384195 + ... + 161384298.

It is an arithmetic number, because the mean of its divisors is an integer number (2635942701).

Almost surely, 2^16783961636 is an apocalyptic number.

It is an amenable number.

16783961636 is a deficient number, since it is larger than the sum of its proper divisors (14847350776).

16783961636 is a wasteful number, since it uses less digits than its factorization.

16783961636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322768510 (or 322768508 counting only the distinct ones).

The product of its digits is 5878656, while the sum is 56.

The spelling of 16783961636 in words is "sixteen billion, seven hundred eighty-three million, nine hundred sixty-one thousand, six hundred thirty-six".