51073820251 has 4 divisors (see below), whose sum is σ = 51793169904. Its totient is φ = 50354470600.

The previous prime is 51073820243. The next prime is 51073820279. The reversal of 51073820251 is 15202837015.

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 51073820251 - 2³ = 51073820243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51073860251) 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, 359674720 + ... + 359674861.

It is an arithmetic number, because the mean of its divisors is an integer number (12948292476).

Almost surely, 2^51073820251 is an apocalyptic number.

51073820251 is a deficient number, since it is larger than the sum of its proper divisors (719349653).

51073820251 is an equidigital number, since it uses as much as digits as its factorization.

51073820251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719349652.

The product of its (nonzero) digits is 16800, while the sum is 34.

The spelling of 51073820251 in words is "fifty-one billion, seventy-three million, eight hundred twenty thousand, two hundred fifty-one".