51212516263 has 4 divisors (see below), whose sum is σ = 51216532848. Its totient is φ = 51208499680.

The previous prime is 51212516261. The next prime is 51212516279. The reversal of 51212516263 is 36261521215.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36261521215 = 5 ⋅7252304243.

It is a cyclic number.

It is not a de Polignac number, because 51212516263 - 2¹ = 51212516261 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 (51212516261) 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, 1989106 + ... + 2014687.

It is an arithmetic number, because the mean of its divisors is an integer number (12804133212).

Almost surely, 2^51212516263 is an apocalyptic number.

51212516263 is a deficient number, since it is larger than the sum of its proper divisors (4016585).

51212516263 is a wasteful number, since it uses less digits than its factorization.

51212516263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4016584.

The product of its digits is 21600, while the sum is 34.

The spelling of 51212516263 in words is "fifty-one billion, two hundred twelve million, five hundred sixteen thousand, two hundred sixty-three".