213581608385 has 8 divisors (see below), whose sum is σ = 256342920936. Its totient is φ = 170835292800.

The previous prime is 213581608381. The next prime is 213581608463. The reversal of 213581608385 is 583806185312.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 70513084849 + 143068523536 = 265543^2 + 378244^2 .

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

It is not a de Polignac number, because 213581608385 - 2² = 213581608381 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (213581608381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3717884 + ... + 3774893.

It is an arithmetic number, because the mean of its divisors is an integer number (32042865117).

Almost surely, 2^213581608385 is an apocalyptic number.

It is an amenable number.

213581608385 is a deficient number, since it is larger than the sum of its proper divisors (42761312551).

213581608385 is an equidigital number, since it uses as much as digits as its factorization.

213581608385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7498483.

The product of its (nonzero) digits is 1382400, while the sum is 50.

The spelling of 213581608385 in words is "two hundred thirteen billion, five hundred eighty-one million, six hundred eight thousand, three hundred eighty-five".