16957439986 has 4 divisors (see below), whose sum is σ = 25436159982. Its totient is φ = 8478719992.

The previous prime is 16957439951. The next prime is 16957439987. The reversal of 16957439986 is 68993475961.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11522949025 + 5434490961 = 107345^2 + 73719^2 .

It is a Smith number, since the sum of its digits (67) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (16957439987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4239359995 + ... + 4239359998.

Almost surely, 2^16957439986 is an apocalyptic number.

16957439986 is a deficient number, since it is larger than the sum of its proper divisors (8478719996).

16957439986 is an equidigital number, since it uses as much as digits as its factorization.

16957439986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8478719995.

The product of its digits is 88179840, while the sum is 67.

The spelling of 16957439986 in words is "sixteen billion, nine hundred fifty-seven million, four hundred thirty-nine thousand, nine hundred eighty-six".