16378887916801 has 8 divisors (see below), whose sum is σ = 16405273377000. Its totient is φ = 16352518116480.

The previous prime is 16378887916753. The next prime is 16378887916817. The reversal of 16378887916801 is 10861978887361.

It can be written as a sum of positive squares in 4 ways, for example, as 1225502136576 + 15153385780225 = 1107024^2 + 3892735^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 16378887916801 - 2²¹ = 16378885819649 is a prime.

It is a super-2 number, since 2×16378887916801² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16378887916871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1820556 + ... + 6006013.

It is an arithmetic number, because the mean of its divisors is an integer number (2050659172125).

Almost surely, 2^{16378887916801} is an apocalyptic number.

It is an amenable number.

16378887916801 is a deficient number, since it is larger than the sum of its proper divisors (26385460199).

16378887916801 is an equidigital number, since it uses as much as digits as its factorization.

16378887916801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7829939.

The product of its (nonzero) digits is 195084288, while the sum is 73.

The spelling of 16378887916801 in words is "sixteen trillion, three hundred seventy-eight billion, eight hundred eighty-seven million, nine hundred sixteen thousand, eight hundred one".