209916597120 has 64 divisors (see below), whose sum is σ = 669109159440. Its totient is φ = 55977758720.

The previous prime is 209916597103. The next prime is 209916597131. The reversal of 209916597120 is 21795619902.

It is a tau number, because it is divible by the number of its divisors (64).

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54663861 + ... + 54667700.

Almost surely, 2^209916597120 is an apocalyptic number.

209916597120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

209916597120 is an abundant number, since it is smaller than the sum of its proper divisors (459192562320).

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

209916597120 is a wasteful number, since it uses less digits than its factorization.

209916597120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109331583 (or 109331571 counting only the distinct ones).

The product of its (nonzero) digits is 612360, while the sum is 51.

The spelling of 209916597120 in words is "two hundred nine billion, nine hundred sixteen million, five hundred ninety-seven thousand, one hundred twenty".