661200611213 has 8 divisors (see below), whose sum is σ = 672232348032. Its totient is φ = 650203082496.

The previous prime is 661200611207. The next prime is 661200611293. The reversal of 661200611213 is 312116002166.

It is a happy number.

661200611213 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 661200611213 - 2²⁰ = 661199562637 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661200611293) 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, 8513045 + ... + 8590362.

It is an arithmetic number, because the mean of its divisors is an integer number (84029043504).

Almost surely, 2^661200611213 is an apocalyptic number.

It is an amenable number.

661200611213 is a deficient number, since it is larger than the sum of its proper divisors (11031736819).

661200611213 is a wasteful number, since it uses less digits than its factorization.

661200611213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17104051.

The product of its (nonzero) digits is 2592, while the sum is 29.

Adding to 661200611213 its reverse (312116002166), we get a palindrome (973316613379).

The spelling of 661200611213 in words is "six hundred sixty-one billion, two hundred million, six hundred eleven thousand, two hundred thirteen".