456720661 has 4 divisors (see below), whose sum is σ = 456766924. Its totient is φ = 456674400.

The previous prime is 456720653. The next prime is 456720703. The reversal of 456720661 is 166027654.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7535025 + 449185636 = 2745^2 + 21194^2 .

It is a cyclic number.

It is not a de Polignac number, because 456720661 - 2³ = 456720653 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 456720661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (456720601) 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, 1710 + ... + 30271.

It is an arithmetic number, because the mean of its divisors is an integer number (114191731).

Almost surely, 2^456720661 is an apocalyptic number.

It is an amenable number.

456720661 is a deficient number, since it is larger than the sum of its proper divisors (46263).

456720661 is a wasteful number, since it uses less digits than its factorization.

456720661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46262.

The product of its (nonzero) digits is 60480, while the sum is 37.

The square root of 456720661 is about 21371.0238641016. The cubic root of 456720661 is about 770.1054901292.

The spelling of 456720661 in words is "four hundred fifty-six million, seven hundred twenty thousand, six hundred sixty-one".