645161546 has 16 divisors (see below), whose sum is σ = 1010358144. Its totient is φ = 308390544.

The previous prime is 645161537. The next prime is 645161567.

It is a happy number.

645161546 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×645161546² = 832466840874220232, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 161651 + ... + 165593.

It is an arithmetic number, because the mean of its divisors is an integer number (63147384).

Almost surely, 2^645161546 is an apocalyptic number.

645161546 is a deficient number, since it is larger than the sum of its proper divisors (365196598).

645161546 is a wasteful number, since it uses less digits than its factorization.

645161546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7525.

The product of its digits is 86400, while the sum is 38.

The square root of 645161546 is about 25400.0304330526. The cubic root of 645161546 is about 864.0843869408.

The spelling of 645161546 in words is "six hundred forty-five million, one hundred sixty-one thousand, five hundred forty-six".