16816817642 has 8 divisors (see below), whose sum is σ = 25266378756. Its totient is φ = 8394691392.

The previous prime is 16816817629. The next prime is 16816817653. The reversal of 16816817642 is 24671861861.

It can be written as a sum of positive squares in 2 ways, for example, as 14638822081 + 2177995561 = 120991^2 + 46669^2 .

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 6857183 + ... + 6859634.

Almost surely, 2^16816817642 is an apocalyptic number.

16816817642 is a deficient number, since it is larger than the sum of its proper divisors (8449561114).

16816817642 is a wasteful number, since it uses less digits than its factorization.

16816817642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13717432.

The product of its digits is 774144, while the sum is 50.

The spelling of 16816817642 in words is "sixteen billion, eight hundred sixteen million, eight hundred seventeen thousand, six hundred forty-two".