630004240256581 has 2 divisors, whose sum is σ = 630004240256582. Its totient is φ = 630004240256580.

The previous prime is 630004240256551. The next prime is 630004240256603. The reversal of 630004240256581 is 185652042400036.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 505169227440900 + 124835012815681 = 22475970^2 + 11172959^2 .

It is a cyclic number.

It is not a de Polignac number, because 630004240256581 - 2⁷ = 630004240256453 is a prime.

It is a super-2 number, since 2×630004240256581² (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 (630004240256551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315002120128290 + 315002120128291.

It is an arithmetic number, because the mean of its divisors is an integer number (315002120128291).

Almost surely, 2^{630004240256581} is an apocalyptic number.

It is an amenable number.

630004240256581 is a deficient number, since it is larger than the sum of its proper divisors (1).

630004240256581 is an equidigital number, since it uses as much as digits as its factorization.

630004240256581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1382400, while the sum is 46.

The spelling of 630004240256581 in words is "six hundred thirty trillion, four billion, two hundred forty million, two hundred fifty-six thousand, five hundred eighty-one".