646015505 has 4 divisors (see below), whose sum is σ = 775218612. Its totient is φ = 516812400.

The previous prime is 646015481. The next prime is 646015519. The reversal of 646015505 is 505510646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505510646 = 2 ⋅252755323.

It can be written as a sum of positive squares in 2 ways, for example, as 256032001 + 389983504 = 16001^2 + 19748^2 .

It is not a de Polignac number, because 646015505 - 2²⁰ = 644966929 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 64601546 + ... + 64601555.

It is an arithmetic number, because the mean of its divisors is an integer number (193804653).

Almost surely, 2^646015505 is an apocalyptic number.

It is an amenable number.

646015505 is a deficient number, since it is larger than the sum of its proper divisors (129203107).

646015505 is a wasteful number, since it uses less digits than its factorization.

646015505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129203106.

The product of its (nonzero) digits is 18000, while the sum is 32.

The square root of 646015505 is about 25416.8350704804. The cubic root of 646015505 is about 864.4654632339.

The spelling of 646015505 in words is "six hundred forty-six million, fifteen thousand, five hundred five".