663521315306231 has 2 divisors, whose sum is σ = 663521315306232. Its totient is φ = 663521315306230.

The previous prime is 663521315306221. The next prime is 663521315306279. The reversal of 663521315306231 is 132603513125366.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-663521315306231 is a prime.

It is a super-2 number, since 2×663521315306231² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (663521315306221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 331760657653115 + 331760657653116.

It is an arithmetic number, because the mean of its divisors is an integer number (331760657653116).

Almost surely, 2^{663521315306231} is an apocalyptic number.

663521315306231 is a deficient number, since it is larger than the sum of its proper divisors (1).

663521315306231 is an equidigital number, since it uses as much as digits as its factorization.

663521315306231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1749600, while the sum is 47.

The spelling of 663521315306231 in words is "six hundred sixty-three trillion, five hundred twenty-one billion, three hundred fifteen million, three hundred six thousand, two hundred thirty-one".