209197542996 has 360 divisors, whose sum is σ = 607107916800. Its totient is φ = 62768369664.

The previous prime is 209197542989. The next prime is 209197543007. The reversal of 209197542996 is 699245791902.

209197542996 is a `hidden beast` number, since 209 + 1 + 97 + 54 + 299 + 6 = 666.

It is a super-2 number, since 2×209197542996² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 465918580 + ... + 465919028.

It is an arithmetic number, because the mean of its divisors is an integer number (1686410880).

Almost surely, 2^209197542996 is an apocalyptic number.

209197542996 is a gapful number since it is divisible by the number (26) 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 209197542996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (303553958400).

209197542996 is an abundant number, since it is smaller than the sum of its proper divisors (397910373804).

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

209197542996 is a wasteful number, since it uses less digits than its factorization.

209197542996 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685 (or 661 counting only the distinct ones).

The product of its (nonzero) digits is 22044960, while the sum is 63.

The spelling of 209197542996 in words is "two hundred nine billion, one hundred ninety-seven million, five hundred forty-two thousand, nine hundred ninety-six".