51555055201 has 4 divisors (see below), whose sum is σ = 55520828692. Its totient is φ = 47589281712.

The previous prime is 51555055193. The next prime is 51555055213. The reversal of 51555055201 is 10255055515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10255055515 = 5 ⋅2051011103.

It can be written as a sum of positive squares in 2 ways, for example, as 14095388176 + 37459667025 = 118724^2 + 193545^2 .

It is a cyclic number.

It is not a de Polignac number, because 51555055201 - 2³ = 51555055193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51555055291) 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, 1982886726 + ... + 1982886751.

It is an arithmetic number, because the mean of its divisors is an integer number (13880207173).

Almost surely, 2^51555055201 is an apocalyptic number.

It is an amenable number.

51555055201 is a deficient number, since it is larger than the sum of its proper divisors (3965773491).

51555055201 is a wasteful number, since it uses less digits than its factorization.

51555055201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3965773490.

The product of its (nonzero) digits is 31250, while the sum is 34.

The spelling of 51555055201 in words is "fifty-one billion, five hundred fifty-five million, fifty-five thousand, two hundred one".