213851064065 has 8 divisors (see below), whose sum is σ = 259266857640. Its totient is φ = 169317130752.

The previous prime is 213851064047. The next prime is 213851064071. The reversal of 213851064065 is 560460158312.

It can be written as a sum of positive squares in 4 ways, for example, as 43109386384 + 170741677681 = 207628^2 + 413209^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 213851064065 - 2¹⁸ = 213850801921 is a prime.

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, 220464530 + ... + 220465499.

It is an arithmetic number, because the mean of its divisors is an integer number (32408357205).

Almost surely, 2^213851064065 is an apocalyptic number.

It is an amenable number.

213851064065 is a deficient number, since it is larger than the sum of its proper divisors (45415793575).

213851064065 is an equidigital number, since it uses as much as digits as its factorization.

213851064065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 440930131.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 213851064065 in words is "two hundred thirteen billion, eight hundred fifty-one million, sixty-four thousand, sixty-five".