51255752251 has 4 divisors (see below), whose sum is σ = 55915366104. Its totient is φ = 46596138400.

The previous prime is 51255752243. The next prime is 51255752389. The reversal of 51255752251 is 15225755215.

It is a happy number.

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 51255752251 - 2³ = 51255752243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51255750251) 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, 2329806910 + ... + 2329806931.

It is an arithmetic number, because the mean of its divisors is an integer number (13978841526).

Almost surely, 2^51255752251 is an apocalyptic number.

51255752251 is a deficient number, since it is larger than the sum of its proper divisors (4659613853).

51255752251 is a wasteful number, since it uses less digits than its factorization.

51255752251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4659613852.

The product of its digits is 175000, while the sum is 40.

The spelling of 51255752251 in words is "fifty-one billion, two hundred fifty-five million, seven hundred fifty-two thousand, two hundred fifty-one".