16691488738 has 16 divisors (see below), whose sum is σ = 25094329344. Its totient is φ = 8326730880.

The previous prime is 16691488687. The next prime is 16691488741. The reversal of 16691488738 is 83788419661.

It is a super-3 number, since 3×16691488738³ (a number of 32 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2523031 + ... + 2529637.

It is an arithmetic number, because the mean of its divisors is an integer number (1568395584).

Almost surely, 2^16691488738 is an apocalyptic number.

16691488738 is a deficient number, since it is larger than the sum of its proper divisors (8402840606).

16691488738 is a wasteful number, since it uses less digits than its factorization.

16691488738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9297.

The product of its digits is 13934592, while the sum is 61.

The spelling of 16691488738 in words is "sixteen billion, six hundred ninety-one million, four hundred eighty-eight thousand, seven hundred thirty-eight".