630685340649 has 81 divisors (see below), whose sum is σ = 1147905295173. Its totient is φ = 332554832064.

The previous prime is 630685340647. The next prime is 630685340657. The reversal of 630685340649 is 946043586036.

The square root of 630685340649 is 794157.

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

630685340649 is a `hidden beast` number, since 6 + 3 + 0 + 68 + 534 + 0 + 6 + 49 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 300155625 + 630385185024 = 17325^2 + 793968^2 .

It is not a de Polignac number, because 630685340649 - 2¹ = 630685340647 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 630685340595 and 630685340604.

It is not an unprimeable number, because it can be changed into a prime (630685340647) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 216803407 + ... + 216806315.

Almost surely, 2^630685340649 is an apocalyptic number.

630685340649 is the 794157-th square number.

630685340649 is the 397079-th centered octagonal number.

It is an amenable number.

630685340649 is a deficient number, since it is larger than the sum of its proper divisors (517219954524).

630685340649 is an equidigital number, since it uses as much as digits as its factorization.

630685340649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5864 (or 2932 counting only the distinct ones).

The product of its (nonzero) digits is 11197440, while the sum is 54.

The spelling of 630685340649 in words is "six hundred thirty billion, six hundred eighty-five million, three hundred forty thousand, six hundred forty-nine".