646263131201 has 4 divisors (see below), whose sum is σ = 646279377492. Its totient is φ = 646246884912.

The previous prime is 646263131191. The next prime is 646263131249. The reversal of 646263131201 is 102131362646.

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

It can be written as a sum of positive squares in 2 ways, for example, as 420486105601 + 225777025600 = 648449^2 + 475160^2 .

It is a cyclic number.

It is not a de Polignac number, because 646263131201 - 2³⁸ = 371385224257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (646263131281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8063330 + ... + 8143083.

It is an arithmetic number, because the mean of its divisors is an integer number (161569844373).

Almost surely, 2^646263131201 is an apocalyptic number.

It is an amenable number.

646263131201 is a deficient number, since it is larger than the sum of its proper divisors (16246291).

646263131201 is a wasteful number, since it uses less digits than its factorization.

646263131201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16246290.

The product of its (nonzero) digits is 31104, while the sum is 35.

Adding to 646263131201 its reverse (102131362646), we get a palindrome (748394493847).

The spelling of 646263131201 in words is "six hundred forty-six billion, two hundred sixty-three million, one hundred thirty-one thousand, two hundred one".