630840632509 has 4 divisors (see below), whose sum is σ = 630842976540. Its totient is φ = 630838288480.

The previous prime is 630840632491. The next prime is 630840632561. The reversal of 630840632509 is 905236048036.

It is a happy number.

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 420191761284 + 210648871225 = 648222^2 + 458965^2 .

It is a cyclic number.

It is not a de Polignac number, because 630840632509 - 2³³ = 622250697917 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 (630840632579) 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, 706762 + ... + 1327099.

It is an arithmetic number, because the mean of its divisors is an integer number (157710744135).

Almost surely, 2^630840632509 is an apocalyptic number.

It is an amenable number.

630840632509 is a deficient number, since it is larger than the sum of its proper divisors (2344031).

630840632509 is a wasteful number, since it uses less digits than its factorization.

630840632509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2344030.

The product of its (nonzero) digits is 933120, while the sum is 46.

The spelling of 630840632509 in words is "six hundred thirty billion, eight hundred forty million, six hundred thirty-two thousand, five hundred nine".