209898400842156 has 96 divisors (see below), whose sum is σ = 537284519339008. Its totient is φ = 63385419525120.

The previous prime is 209898400842061. The next prime is 209898400842239. The reversal of 209898400842156 is 651248004898902.

It is a super-2 number, since 2×209898400842156² (a number of 29 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (66) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34219405 + ... + 39884388.

Almost surely, 2^{209898400842156} is an apocalyptic number.

209898400842156 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

209898400842156 is an abundant number, since it is smaller than the sum of its proper divisors (327386118496852).

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

209898400842156 is a wasteful number, since it uses less digits than its factorization.

209898400842156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74104151 (or 74104149 counting only the distinct ones).

The product of its (nonzero) digits is 79626240, while the sum is 66.

The spelling of 209898400842156 in words is "two hundred nine trillion, eight hundred ninety-eight billion, four hundred million, eight hundred forty-two thousand, one hundred fifty-six".