51000010002 has 24 divisors (see below), whose sum is σ = 112013723484. Its totient is φ = 16767126144.

The previous prime is 51000009953. The next prime is 51000010037. The reversal of 51000010002 is 20001000015.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 45245118681 + 5754891321 = 212709^2 + 75861^2 .

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19405083 + ... + 19407710.

Almost surely, 2^51000010002 is an apocalyptic number.

51000010002 is an abundant number, since it is smaller than the sum of its proper divisors (61013713482).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51000010002 is a wasteful number, since it uses less digits than its factorization.

51000010002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38812874 (or 38812871 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 9.

Adding to 51000010002 its reverse (20001000015), we get a palindrome (71001010017).

The spelling of 51000010002 in words is "fifty-one billion, ten thousand, two".