662944649 has 4 divisors (see below), whose sum is σ = 669026820. Its totient is φ = 656862480.

The previous prime is 662944643. The next prime is 662944661. The reversal of 662944649 is 946449266.

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

It can be written as a sum of positive squares in 2 ways, for example, as 206353225 + 456591424 = 14365^2 + 21368^2 .

It is a cyclic number.

It is not a de Polignac number, because 662944649 - 2²⁰ = 661896073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 662944597 and 662944606.

It is not an unprimeable number, because it can be changed into a prime (662944643) 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, 3040922 + ... + 3041139.

It is an arithmetic number, because the mean of its divisors is an integer number (167256705).

Almost surely, 2^662944649 is an apocalyptic number.

It is an amenable number.

662944649 is a deficient number, since it is larger than the sum of its proper divisors (6082171).

662944649 is a wasteful number, since it uses less digits than its factorization.

662944649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6082170.

The product of its digits is 2239488, while the sum is 50.

The square root of 662944649 is about 25747.7115293767. The cubic root of 662944649 is about 871.9516888372.

The spelling of 662944649 in words is "six hundred sixty-two million, nine hundred forty-four thousand, six hundred forty-nine".