209345762680 has 16 divisors (see below), whose sum is σ = 471027966120. Its totient is φ = 83738305056.

The previous prime is 209345762671. The next prime is 209345762723. The reversal of 209345762680 is 86267543902.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2616821994 + ... + 2616822073.

Almost surely, 2^209345762680 is an apocalyptic number.

209345762680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209345762680 is an abundant number, since it is smaller than the sum of its proper divisors (261682203440).

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

209345762680 is a wasteful number, since it uses less digits than its factorization.

209345762680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5233644078 (or 5233644074 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 52.

The spelling of 209345762680 in words is "two hundred nine billion, three hundred forty-five million, seven hundred sixty-two thousand, six hundred eighty".