646411451 has 16 divisors (see below), whose sum is σ = 784442880. Its totient is φ = 519987840.

The previous prime is 646411439. The next prime is 646411471. The reversal of 646411451 is 154114646.

It is not a de Polignac number, because 646411451 - 2¹⁸ = 646149307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646411471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35156 + ... + 50286.

It is an arithmetic number, because the mean of its divisors is an integer number (49027680).

Almost surely, 2^646411451 is an apocalyptic number.

646411451 is a deficient number, since it is larger than the sum of its proper divisors (138031429).

646411451 is a wasteful number, since it uses less digits than its factorization.

646411451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15514.

The product of its digits is 11520, while the sum is 32.

The square root of 646411451 is about 25424.6229273907. The cubic root of 646411451 is about 864.6420388397.

The spelling of 646411451 in words is "six hundred forty-six million, four hundred eleven thousand, four hundred fifty-one".