645646546 has 16 divisors (see below), whose sum is σ = 1003104000. Its totient is φ = 311306128.

The previous prime is 645646513. The next prime is 645646571.

645646546 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 645646496 and 645646505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43605 + ... + 56503.

It is an arithmetic number, because the mean of its divisors is an integer number (62694000).

Almost surely, 2^645646546 is an apocalyptic number.

645646546 is a deficient number, since it is larger than the sum of its proper divisors (357457454).

645646546 is a wasteful number, since it uses less digits than its factorization.

645646546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13793.

The product of its digits is 2073600, while the sum is 46.

The square root of 645646546 is about 25409.5758720999. The cubic root of 645646546 is about 864.3008577661.

The spelling of 645646546 in words is "six hundred forty-five million, six hundred forty-six thousand, five hundred forty-six".