209094232233864 has 128 divisors (see below), whose sum is σ = 554686466457600. Its totient is φ = 65497337579520.

The previous prime is 209094232233853. The next prime is 209094232233893. The reversal of 209094232233864 is 468332232490902.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 305491429 + ... + 306175115.

It is an arithmetic number, because the mean of its divisors is an integer number (4333488019200).

Almost surely, 2^{209094232233864} is an apocalyptic number.

209094232233864 is a gapful number since it is divisible by the number (24) 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 209094232233864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (277343233228800).

209094232233864 is an abundant number, since it is smaller than the sum of its proper divisors (345592234223736).

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

209094232233864 is a wasteful number, since it uses less digits than its factorization.

209094232233864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689123 (or 689119 counting only the distinct ones).

The product of its (nonzero) digits is 26873856, while the sum is 57.

The spelling of 209094232233864 in words is "two hundred nine trillion, ninety-four billion, two hundred thirty-two million, two hundred thirty-three thousand, eight hundred sixty-four".