51000510551 has 4 divisors (see below), whose sum is σ = 51144988272. Its totient is φ = 50856032832.

The previous prime is 51000510413. The next prime is 51000510571. The reversal of 51000510551 is 15501500015.

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 51000510551 - 2³⁴ = 33820641367 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 (51000510571) 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, 72238331 + ... + 72239036.

It is an arithmetic number, because the mean of its divisors is an integer number (12786247068).

Almost surely, 2^51000510551 is an apocalyptic number.

51000510551 is a deficient number, since it is larger than the sum of its proper divisors (144477721).

51000510551 is a wasteful number, since it uses less digits than its factorization.

51000510551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144477720.

The product of its (nonzero) digits is 625, while the sum is 23.

The spelling of 51000510551 in words is "fifty-one billion, five hundred ten thousand, five hundred fifty-one".