720661120111 has 4 divisors (see below), whose sum is σ = 721016653032. Its totient is φ = 720305587192.

The previous prime is 720661120073. The next prime is 720661120129. The reversal of 720661120111 is 111021166027.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 720661120111 - 2²⁹ = 720124249199 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 720661120111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720661123111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 177763420 + ... + 177767473.

It is an arithmetic number, because the mean of its divisors is an integer number (180254163258).

Almost surely, 2^720661120111 is an apocalyptic number.

720661120111 is a deficient number, since it is larger than the sum of its proper divisors (355532921).

720661120111 is a wasteful number, since it uses less digits than its factorization.

720661120111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355532920.

The product of its (nonzero) digits is 1008, while the sum is 28.

Adding to 720661120111 its reverse (111021166027), we get a palindrome (831682286138).

The spelling of 720661120111 in words is "seven hundred twenty billion, six hundred sixty-one million, one hundred twenty thousand, one hundred eleven".