646520501 has 16 divisors (see below), whose sum is σ = 741616128. Its totient is φ = 557871600.

The previous prime is 646520491. The next prime is 646520503. The reversal of 646520501 is 105025646.

646520501 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-646520501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646520503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23390 + ... + 42896.

It is an arithmetic number, because the mean of its divisors is an integer number (46351008).

Almost surely, 2^646520501 is an apocalyptic number.

It is an amenable number.

646520501 is a deficient number, since it is larger than the sum of its proper divisors (95095627).

646520501 is a wasteful number, since it uses less digits than its factorization.

646520501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19672.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 646520501 is about 25426.7674115291. The cubic root of 646520501 is about 864.6906579828.

The spelling of 646520501 in words is "six hundred forty-six million, five hundred twenty thousand, five hundred one".