51405245215 has 4 divisors (see below), whose sum is σ = 61686294264. Its totient is φ = 41124196168.

The previous prime is 51405245191. The next prime is 51405245263. The reversal of 51405245215 is 51254250415.

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

It is a cyclic number.

It is not a de Polignac number, because 51405245215 - 2⁵ = 51405245183 is a prime.

It is a super-2 number, since 2×51405245215² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5140524517 + ... + 5140524526.

It is an arithmetic number, because the mean of its divisors is an integer number (15421573566).

Almost surely, 2^51405245215 is an apocalyptic number.

51405245215 is a deficient number, since it is larger than the sum of its proper divisors (10281049049).

51405245215 is a wasteful number, since it uses less digits than its factorization.

51405245215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10281049048.

The product of its (nonzero) digits is 40000, while the sum is 34.

The spelling of 51405245215 in words is "fifty-one billion, four hundred five million, two hundred forty-five thousand, two hundred fifteen".