646018522 has 4 divisors (see below), whose sum is σ = 969027786. Its totient is φ = 323009260.

The previous prime is 646018511. The next prime is 646018559. The reversal of 646018522 is 225810646.

646018522 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 423083761 + 222934761 = 20569^2 + 14931^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161504629 + ... + 161504632.

Almost surely, 2^646018522 is an apocalyptic number.

646018522 is a deficient number, since it is larger than the sum of its proper divisors (323009264).

646018522 is a wasteful number, since it uses less digits than its factorization.

646018522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323009263.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 646018522 is about 25416.8944208375. The cubic root of 646018522 is about 864.4668089644.

The spelling of 646018522 in words is "six hundred forty-six million, eighteen thousand, five hundred twenty-two".