212556312065 has 8 divisors (see below), whose sum is σ = 255072924288. Its totient is φ = 170041483120.

The previous prime is 212556312053. The next prime is 212556312071. The reversal of 212556312065 is 560213655212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 212556312065 - 2³⁴ = 195376442881 is a prime.

It is a Duffinian 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, 167831 + ... + 673260.

It is an arithmetic number, because the mean of its divisors is an integer number (31884115536).

Almost surely, 2^212556312065 is an apocalyptic number.

It is an amenable number.

212556312065 is a deficient number, since it is larger than the sum of its proper divisors (42516612223).

212556312065 is an equidigital number, since it uses as much as digits as its factorization.

212556312065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 891639.

The product of its (nonzero) digits is 108000, while the sum is 38.

Adding to 212556312065 its reverse (560213655212), we get a palindrome (772769967277).

The spelling of 212556312065 in words is "two hundred twelve billion, five hundred fifty-six million, three hundred twelve thousand, sixty-five".