209023197945560 has 64 divisors (see below), whose sum is σ = 484557796205280. Its totient is φ = 81098525301760.

The previous prime is 209023197945559. The next prime is 209023197945563. The reversal of 209023197945560 is 65549791320902.

It is a junction number, because it is equal to n+sod(n) for n = 209023197945493 and 209023197945502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209023197945563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 368078042 + ... + 368645481.

Almost surely, 2^{209023197945560} is an apocalyptic number.

209023197945560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209023197945560 is an abundant number, since it is smaller than the sum of its proper divisors (275534598259720).

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

209023197945560 is a wasteful number, since it uses less digits than its factorization.

209023197945560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 736723748 (or 736723744 counting only the distinct ones).

The product of its (nonzero) digits is 36741600, while the sum is 62.

The spelling of 209023197945560 in words is "two hundred nine trillion, twenty-three billion, one hundred ninety-seven million, nine hundred forty-five thousand, five hundred sixty".