630421708081 has 81 divisors (see below), whose sum is σ = 763247012619. Its totient is φ = 520222903200.

The previous prime is 630421708073. The next prime is 630421708093. The reversal of 630421708081 is 180807124036.

The square root of 630421708081 is 793991.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 330577851681 + 299843856400 = 574959^2 + 547580^2 .

It is not a de Polignac number, because 630421708081 - 2³ = 630421708073 is a prime.

It is a super-2 number, since 2×630421708081² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (630421702081) 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 in 80 ways as a sum of consecutive naturals, for example, 4812379386 + ... + 4812379516.

Almost surely, 2^630421708081 is an apocalyptic number.

630421708081 is the 793991-st square number.

630421708081 is the 396996-th centered octagonal number.

It is an amenable number.

630421708081 is a deficient number, since it is larger than the sum of its proper divisors (132825304538).

630421708081 is a wasteful number, since it uses less digits than its factorization.

630421708081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 380 (or 190 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The spelling of 630421708081 in words is "six hundred thirty billion, four hundred twenty-one million, seven hundred eight thousand, eighty-one".