213418128785 has 8 divisors (see below), whose sum is σ = 256740414696. Its totient is φ = 170308729600.

The previous prime is 213418128761. The next prime is 213418128799. The reversal of 213418128785 is 587821814312.

It is a happy number.

It is a Cunningham number, because it is equal to 461972²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 57090412096 + 156327716689 = 238936^2 + 395383^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-213418128785 is a prime.

It is a Duffinian number.

It is a Curzon 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, 53219474 + ... + 53223483.

It is an arithmetic number, because the mean of its divisors is an integer number (32092551837).

Almost surely, 2^213418128785 is an apocalyptic number.

It is an amenable number.

213418128785 is a deficient number, since it is larger than the sum of its proper divisors (43322285911).

213418128785 is a wasteful number, since it uses less digits than its factorization.

213418128785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106443363.

The product of its digits is 860160, while the sum is 50.

The spelling of 213418128785 in words is "two hundred thirteen billion, four hundred eighteen million, one hundred twenty-eight thousand, seven hundred eighty-five".