16378644687361 has 16 divisors (see below), whose sum is σ = 18996247474560. Its totient is φ = 13973577080320.

The previous prime is 16378644687277. The next prime is 16378644687367.

16378644687361 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 16378644687361 - 2¹¹ = 16378644685313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16378644687367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 610719856 + ... + 610746673.

It is an arithmetic number, because the mean of its divisors is an integer number (1187265467160).

Almost surely, 2^{16378644687361} is an apocalyptic number.

16378644687361 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

16378644687361 is a deficient number, since it is larger than the sum of its proper divisors (2617602787199).

16378644687361 is a wasteful number, since it uses less digits than its factorization.

16378644687361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1221466616.

The product of its digits is 585252864, while the sum is 70.

It can be divided in two parts, 1637864 and 4687361, that added together give a square (6325225 = 2515²).

The spelling of 16378644687361 in words is "sixteen trillion, three hundred seventy-eight billion, six hundred forty-four million, six hundred eighty-seven thousand, three hundred sixty-one".