209366166864 has 40 divisors (see below), whose sum is σ = 541698632640. Its totient is φ = 69680846848.

The previous prime is 209366166857. The next prime is 209366166901. The reversal of 209366166864 is 468661663902.

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, 3339729 + ... + 3401840.

It is an arithmetic number, because the mean of its divisors is an integer number (13542465816).

Almost surely, 2^209366166864 is an apocalyptic number.

209366166864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

209366166864 is an abundant number, since it is smaller than the sum of its proper divisors (332332465776).

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

209366166864 is a wasteful number, since it uses less digits than its factorization.

209366166864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6742227 (or 6742221 counting only the distinct ones).

The product of its (nonzero) digits is 13436928, while the sum is 57.

The spelling of 209366166864 in words is "two hundred nine billion, three hundred sixty-six million, one hundred sixty-six thousand, eight hundred sixty-four".