213457065665 has 16 divisors (see below), whose sum is σ = 266534281728. Its totient is φ = 163978890816.

The previous prime is 213457065649. The next prime is 213457065721. The reversal of 213457065665 is 566560754312.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 213457065665 - 2⁴ = 213457065649 is a prime.

It is a Duffinian 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, 8556677 + ... + 8581586.

It is an arithmetic number, because the mean of its divisors is an integer number (16658392608).

Almost surely, 2^213457065665 is an apocalyptic number.

It is an amenable number.

213457065665 is a deficient number, since it is larger than the sum of its proper divisors (53077216063).

213457065665 is a wasteful number, since it uses less digits than its factorization.

213457065665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17138368.

The product of its (nonzero) digits is 4536000, while the sum is 50.

The spelling of 213457065665 in words is "two hundred thirteen billion, four hundred fifty-seven million, sixty-five thousand, six hundred sixty-five".