630704400561 has 15 divisors (see below), whose sum is σ = 942174041083. Its totient is φ = 420464835360.

The previous prime is 630704400551. The next prime is 630704400577. The reversal of 630704400561 is 165004407036.

It is a happy number.

The square root of 630704400561 is 794169.

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., 612962160561 + 17742240000 = 782919^2 + 133200^2 .

It is not a de Polignac number, because 630704400561 - 2²¹ = 630702303409 is a prime.

It is a super-2 number, since 2×630704400561² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (630704400551) 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 14 ways as a sum of consecutive naturals, for example, 7103401 + ... + 7191641.

Almost surely, 2^630704400561 is an apocalyptic number.

630704400561 is the 794169-th square number.

630704400561 is the 397085-th centered octagonal number.

It is an amenable number.

630704400561 is a deficient number, since it is larger than the sum of its proper divisors (311469640522).

630704400561 is an frugal number, since it uses more digits than its factorization.

630704400561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176494 (or 88244 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

Multiplying 630704400561 by its sum of digits (36), we get a square (22705358420196 = 4765014²).

Adding to 630704400561 its reverse (165004407036), we get a palindrome (795708807597).

The spelling of 630704400561 in words is "six hundred thirty billion, seven hundred four million, four hundred thousand, five hundred sixty-one".