646326116522 has 4 divisors (see below), whose sum is σ = 969489174786. Its totient is φ = 323163058260.

The previous prime is 646326116521. The next prime is 646326116531. The reversal of 646326116522 is 225611623646.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 225611623646 = 2 ⋅112805811823.

It can be written as a sum of positive squares in only one way, i.e., 398452575361 + 247873541161 = 631231^2 + 497869^2 .

It is not an unprimeable number, because it can be changed into a prime (646326116521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161581529129 + ... + 161581529132.

Almost surely, 2^646326116522 is an apocalyptic number.

646326116522 is a deficient number, since it is larger than the sum of its proper divisors (323163058264).

646326116522 is a wasteful number, since it uses less digits than its factorization.

646326116522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323163058263.

The product of its digits is 622080, while the sum is 44.

The spelling of 646326116522 in words is "six hundred forty-six billion, three hundred twenty-six million, one hundred sixteen thousand, five hundred twenty-two".