630687919681 has 16 divisors (see below), whose sum is σ = 670015622016. Its totient is φ = 591610957056.

The previous prime is 630687919571. The next prime is 630687919709. The reversal of 630687919681 is 186919786036.

It is a cyclic number.

It is not a de Polignac number, because 630687919681 - 2⁷ = 630687919553 is a prime.

It is a super-2 number, since 2×630687919681² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (630687917681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6467175 + ... + 6563971.

It is an arithmetic number, because the mean of its divisors is an integer number (41875976376).

Almost surely, 2^630687919681 is an apocalyptic number.

It is an amenable number.

630687919681 is a deficient number, since it is larger than the sum of its proper divisors (39327702335).

630687919681 is a wasteful number, since it uses less digits than its factorization.

630687919681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98088.

The product of its (nonzero) digits is 23514624, while the sum is 64.

The spelling of 630687919681 in words is "six hundred thirty billion, six hundred eighty-seven million, nine hundred nineteen thousand, six hundred eighty-one".