646006331662225 has 6 divisors (see below), whose sum is σ = 801047851261190. Its totient is φ = 516805065329760.

The previous prime is 646006331662193. The next prime is 646006331662249. The reversal of 646006331662225 is 522266133600646.

It can be written as a sum of positive squares in 3 ways, for example, as 2272869820816 + 643733461841409 = 1507604^2 + 25371903^2 .

It is not a de Polignac number, because 646006331662225 - 2⁵ = 646006331662193 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12920126633220 + ... + 12920126633269.

Almost surely, 2^{646006331662225} is an apocalyptic number.

It is an amenable number.

646006331662225 is a deficient number, since it is larger than the sum of its proper divisors (155041519598965).

646006331662225 is a wasteful number, since it uses less digits than its factorization.

646006331662225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25840253266499 (or 25840253266494 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 52.

The spelling of 646006331662225 in words is "six hundred forty-six trillion, six billion, three hundred thirty-one million, six hundred sixty-two thousand, two hundred twenty-five".