16689139546 has 4 divisors (see below), whose sum is σ = 25033709322. Its totient is φ = 8344569772.

The previous prime is 16689139529. The next prime is 16689139567. The reversal of 16689139546 is 64593198661.

It is a happy number.

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., 13936983025 + 2752156521 = 118055^2 + 52461^2 .

It is a super-2 number, since 2×16689139546² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4172284885 + ... + 4172284888.

Almost surely, 2^16689139546 is an apocalyptic number.

16689139546 is a deficient number, since it is larger than the sum of its proper divisors (8344569776).

16689139546 is an equidigital number, since it uses as much as digits as its factorization.

16689139546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8344569775.

The product of its digits is 8398080, while the sum is 58.

The spelling of 16689139546 in words is "sixteen billion, six hundred eighty-nine million, one hundred thirty-nine thousand, five hundred forty-six".