630778759531 has 2 divisors, whose sum is σ = 630778759532. Its totient is φ = 630778759530.

The previous prime is 630778759529. The next prime is 630778759543. The reversal of 630778759531 is 135957877036.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 630778759531 - 2¹ = 630778759529 is a prime.

It is a super-2 number, since 2×630778759531² (a number of 24 digits) contains 22 as substring.

Together with 630778759529, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 630778759531.

It is not a weakly prime, because it can be changed into another prime (630778729531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315389379765 + 315389379766.

It is an arithmetic number, because the mean of its divisors is an integer number (315389379766).

Almost surely, 2^630778759531 is an apocalyptic number.

630778759531 is a deficient number, since it is larger than the sum of its proper divisors (1).

630778759531 is an equidigital number, since it uses as much as digits as its factorization.

630778759531 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 33339600, while the sum is 61.

The spelling of 630778759531 in words is "six hundred thirty billion, seven hundred seventy-eight million, seven hundred fifty-nine thousand, five hundred thirty-one".