16518331677 has 8 divisors (see below), whose sum is σ = 22089798016. Its totient is φ = 10979543232.

The previous prime is 16518331637. The next prime is 16518331693. The reversal of 16518331677 is 77613381561.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16518331677 - 2²³ = 16509943069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16518331637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8168293 + ... + 8170314.

It is an arithmetic number, because the mean of its divisors is an integer number (2761224752).

Almost surely, 2^16518331677 is an apocalyptic number.

It is an amenable number.

16518331677 is a deficient number, since it is larger than the sum of its proper divisors (5571466339).

16518331677 is a wasteful number, since it uses less digits than its factorization.

16518331677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16338947.

The product of its digits is 635040, while the sum is 48.

It can be divided in two parts, 16518 and 331677, that added together give a triangular number (348195 = T₈₃₄).

The spelling of 16518331677 in words is "sixteen billion, five hundred eighteen million, three hundred thirty-one thousand, six hundred seventy-seven".