209651141680 has 160 divisors (see below), whose sum is σ = 507117542400. Its totient is φ = 80544921600.

The previous prime is 209651141671. The next prime is 209651141681. The reversal of 209651141680 is 86141156902.

It is not an unprimeable number, because it can be changed into a prime (209651141681) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 108570315 + ... + 108572245.

It is an arithmetic number, because the mean of its divisors is an integer number (3169484640).

Almost surely, 2^209651141680 is an apocalyptic number.

209651141680 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 209651141680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (253558771200).

209651141680 is an abundant number, since it is smaller than the sum of its proper divisors (297466400720).

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

209651141680 is a wasteful number, since it uses less digits than its factorization.

209651141680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2483 (or 2477 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 43.

The spelling of 209651141680 in words is "two hundred nine billion, six hundred fifty-one million, one hundred forty-one thousand, six hundred eighty".