646456515 has 48 divisors (see below), whose sum is σ = 1088887968. Its totient is φ = 327467008.

The previous prime is 646456493. The next prime is 646456549. The reversal of 646456515 is 515654646.

It is not a de Polignac number, because 646456515 - 2⁵ = 646456483 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2039137 + ... + 2039453.

It is an arithmetic number, because the mean of its divisors is an integer number (22685166).

Almost surely, 2^646456515 is an apocalyptic number.

646456515 is a deficient number, since it is larger than the sum of its proper divisors (442431453).

646456515 is a wasteful number, since it uses less digits than its factorization.

646456515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 628 (or 605 counting only the distinct ones).

The product of its digits is 432000, while the sum is 42.

The square root of 646456515 is about 25425.5091394450. The cubic root of 646456515 is about 864.6621309566.

The spelling of 646456515 in words is "six hundred forty-six million, four hundred fifty-six thousand, five hundred fifteen".