209494609164 has 72 divisors (see below), whose sum is σ = 555385390560. Its totient is φ = 66456268032.

The previous prime is 209494609139. The next prime is 209494609169. The reversal of 209494609164 is 461906494902.

It is a happy number.

209494609164 is a `hidden beast` number, since 2 + 0 + 9 + 494 + 6 + 0 + 91 + 64 = 666.

It is a super-2 number, since 2×209494609164² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 209494609164.

It is not an unprimeable number, because it can be changed into a prime (209494609169) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 479049 + ... + 805280.

It is an arithmetic number, because the mean of its divisors is an integer number (7713685980).

Almost surely, 2^209494609164 is an apocalyptic number.

It is an amenable number.

209494609164 is an abundant number, since it is smaller than the sum of its proper divisors (345890781396).

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

209494609164 is a wasteful number, since it uses less digits than its factorization.

209494609164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1284559 (or 1284554 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 54.

The spelling of 209494609164 in words is "two hundred nine billion, four hundred ninety-four million, six hundred nine thousand, one hundred sixty-four".