630420661 has 4 divisors (see below), whose sum is σ = 678914572. Its totient is φ = 581926752.

The previous prime is 630420643. The next prime is 630420701. The reversal of 630420661 is 166024036.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 348382225 + 282038436 = 18665^2 + 16794^2 .

It is a cyclic number.

It is not a de Polignac number, because 630420661 - 2⁷ = 630420533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (630480661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24246936 + ... + 24246961.

It is an arithmetic number, because the mean of its divisors is an integer number (169728643).

Almost surely, 2^630420661 is an apocalyptic number.

It is an amenable number.

630420661 is a deficient number, since it is larger than the sum of its proper divisors (48493911).

630420661 is a wasteful number, since it uses less digits than its factorization.

630420661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48493910.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 630420661 is about 25108.1791653636. The cubic root of 630420661 is about 857.4526482365.

Adding to 630420661 its reverse (166024036), we get a palindrome (796444697).

The spelling of 630420661 in words is "six hundred thirty million, four hundred twenty thousand, six hundred sixty-one".