51504244251 has 8 divisors (see below), whose sum is σ = 68728481280. Its totient is φ = 34308085032.

The previous prime is 51504244249. The next prime is 51504244271. The reversal of 51504244251 is 15244240515.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51504244251 - 2¹ = 51504244249 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51504244271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7015171 + ... + 7022508.

It is an arithmetic number, because the mean of its divisors is an integer number (8591060160).

Almost surely, 2^51504244251 is an apocalyptic number.

51504244251 is a deficient number, since it is larger than the sum of its proper divisors (17224237029).

51504244251 is a wasteful number, since it uses less digits than its factorization.

51504244251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14038905.

The product of its (nonzero) digits is 32000, while the sum is 33.

Adding to 51504244251 its reverse (15244240515), we get a palindrome (66748484766).

The spelling of 51504244251 in words is "fifty-one billion, five hundred four million, two hundred forty-four thousand, two hundred fifty-one".