651253842009 has 57 divisors (see below), whose sum is σ = 1001288252959. Its totient is φ = 423579734640.

The previous prime is 651253841977. The next prime is 651253842017. The reversal of 651253842009 is 900248352156.

The square root of 651253842009 is 807003.

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

651253842009 is a `hidden beast` number, since 6 + 512 + 53 + 84 + 2 + 0 + 0 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 31381059609 + 619872782400 = 177147^2 + 787320^2 .

It is not a de Polignac number, because 651253842009 - 2⁵ = 651253841977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (651253842059) by changing a digit.

It is a polite number, since it can be written in 56 ways as a sum of consecutive naturals, for example, 15884240029 + ... + 15884240069.

Almost surely, 2^651253842009 is an apocalyptic number.

651253842009 is the 807003-rd square number.

651253842009 is the 403502-nd centered octagonal number.

It is an amenable number.

651253842009 is a deficient number, since it is larger than the sum of its proper divisors (350034410950).

651253842009 is an frugal number, since it uses more digits than its factorization.

651253842009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136 (or 44 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 651253842009 in words is "six hundred fifty-one billion, two hundred fifty-three million, eight hundred forty-two thousand, nine".