209154858234 has 32 divisors (see below), whose sum is σ = 485203600896. Its totient is φ = 58866611760.

The previous prime is 209154858217. The next prime is 209154858257. The reversal of 209154858234 is 432858451902.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37160452 + ... + 37166079.

It is an arithmetic number, because the mean of its divisors is an integer number (15162612528).

Almost surely, 2^209154858234 is an apocalyptic number.

209154858234 is an abundant number, since it is smaller than the sum of its proper divisors (276048742662).

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

209154858234 is a wasteful number, since it uses less digits than its factorization.

209154858234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74326610.

The product of its (nonzero) digits is 2764800, while the sum is 51.

The spelling of 209154858234 in words is "two hundred nine billion, one hundred fifty-four million, eight hundred fifty-eight thousand, two hundred thirty-four".