51255545551 has 8 divisors (see below), whose sum is σ = 58950874400. Its totient is φ = 43653493728.

The previous prime is 51255545503. The next prime is 51255545573. The reversal of 51255545551 is 15554555215.

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

It is a cyclic number.

It is not a de Polignac number, because 51255545551 - 2⁹ = 51255545039 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51255545498 and 51255545507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51255545351) 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, 23318076 + ... + 23320273.

It is an arithmetic number, because the mean of its divisors is an integer number (7368859300).

Almost surely, 2^51255545551 is an apocalyptic number.

51255545551 is a deficient number, since it is larger than the sum of its proper divisors (7695328849).

51255545551 is a wasteful number, since it uses less digits than its factorization.

51255545551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46638513.

The product of its digits is 625000, while the sum is 43.

The spelling of 51255545551 in words is "fifty-one billion, two hundred fifty-five million, five hundred forty-five thousand, five hundred fifty-one".