646452445 has 4 divisors (see below), whose sum is σ = 775742940. Its totient is φ = 517161952.

The previous prime is 646452437. The next prime is 646452473. The reversal of 646452445 is 544254646.

It is a happy number.

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 181360089 + 465092356 = 13467^2 + 21566^2 .

It is a cyclic number.

It is not a de Polignac number, because 646452445 - 2³ = 646452437 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 646452398 and 646452407.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64645240 + ... + 64645249.

It is an arithmetic number, because the mean of its divisors is an integer number (193935735).

Almost surely, 2^646452445 is an apocalyptic number.

It is an amenable number.

646452445 is a deficient number, since it is larger than the sum of its proper divisors (129290495).

646452445 is a wasteful number, since it uses less digits than its factorization.

646452445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129290494.

The product of its digits is 460800, while the sum is 40.

The square root of 646452445 is about 25425.4291015904. The cubic root of 646452445 is about 864.6603163555.

The spelling of 646452445 in words is "six hundred forty-six million, four hundred fifty-two thousand, four hundred forty-five".