209870396160 has 144 divisors (see below), whose sum is σ = 672198424800. Its totient is φ = 55804723200.

The previous prime is 209870396129. The next prime is 209870396161. The reversal of 209870396160 is 61693078902.

It is not an unprimeable number, because it can be changed into a prime (209870396161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1261860 + ... + 1418460.

Almost surely, 2^209870396160 is an apocalyptic number.

209870396160 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209870396160, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (336099212400).

209870396160 is an abundant number, since it is smaller than the sum of its proper divisors (462328028640).

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

209870396160 is a wasteful number, since it uses less digits than its factorization.

209870396160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156974 (or 156960 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 51.

The spelling of 209870396160 in words is "two hundred nine billion, eight hundred seventy million, three hundred ninety-six thousand, one hundred sixty".