6506663521631 has 32 divisors (see below), whose sum is σ = 8217919987200. Its totient is φ = 5013996349824.

The previous prime is 6506663521607. The next prime is 6506663521639. The reversal of 6506663521631 is 1361253666056.

It is a de Polignac number, because none of the positive numbers 2^k-6506663521631 is a prime.

It is a super-2 number, since 2×6506663521631² (a number of 26 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6506663521631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6506663521639) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1016645 + ... + 3747918.

It is an arithmetic number, because the mean of its divisors is an integer number (256809999600).

Almost surely, 2^{6506663521631} is an apocalyptic number.

6506663521631 is a deficient number, since it is larger than the sum of its proper divisors (1711256465569).

6506663521631 is a wasteful number, since it uses less digits than its factorization.

6506663521631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4764975.

The product of its (nonzero) digits is 3499200, while the sum is 50.

The spelling of 6506663521631 in words is "six trillion, five hundred six billion, six hundred sixty-three million, five hundred twenty-one thousand, six hundred thirty-one".