51055605551 has 4 divisors (see below), whose sum is σ = 53275414512. Its totient is φ = 48835796592.

The previous prime is 51055605533. The next prime is 51055605571. The reversal of 51055605551 is 15550655015.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-51055605551 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 (51055605571) 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, 1109904446 + ... + 1109904491.

It is an arithmetic number, because the mean of its divisors is an integer number (13318853628).

Almost surely, 2^51055605551 is an apocalyptic number.

51055605551 is a deficient number, since it is larger than the sum of its proper divisors (2219808961).

51055605551 is a wasteful number, since it uses less digits than its factorization.

51055605551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2219808960.

The product of its (nonzero) digits is 93750, while the sum is 38.

The spelling of 51055605551 in words is "fifty-one billion, fifty-five million, six hundred five thousand, five hundred fifty-one".