16778530198850 has 72 divisors (see below), whose sum is σ = 36305418763188. Its totient is φ = 5752296950400.

The previous prime is 16778530198849. The next prime is 16778530198867. The reversal of 16778530198850 is 5889103587761.

It can be written as a sum of positive squares in 6 ways, for example, as 5537470231489 + 11241059967361 = 2353183^2 + 3352769^2 .

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 35 ways as a sum of consecutive naturals, for example, 42878684 + ... + 43268216.

Almost surely, 2^{16778530198850} is an apocalyptic number.

16778530198850 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16778530198850 is an abundant number, since it is smaller than the sum of its proper divisors (19526888564338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16778530198850 is a wasteful number, since it uses less digits than its factorization.

16778530198850 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407140 (or 407128 counting only the distinct ones).

The product of its (nonzero) digits is 101606400, while the sum is 68.

The spelling of 16778530198850 in words is "sixteen trillion, seven hundred seventy-eight billion, five hundred thirty million, one hundred ninety-eight thousand, eight hundred fifty".