51051155551 has 4 divisors (see below), whose sum is σ = 55692169704. Its totient is φ = 46410141400.

The previous prime is 51051155543. The next prime is 51051155579. The reversal of 51051155551 is 15555115015.

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 51051155551 - 2³ = 51051155543 is a prime.

It is a super-2 number, since 2×51051155551² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51051155501) 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, 2320507060 + ... + 2320507081.

It is an arithmetic number, because the mean of its divisors is an integer number (13923042426).

Almost surely, 2^51051155551 is an apocalyptic number.

51051155551 is a deficient number, since it is larger than the sum of its proper divisors (4641014153).

51051155551 is a wasteful number, since it uses less digits than its factorization.

51051155551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4641014152.

The product of its (nonzero) digits is 15625, while the sum is 34.

It can be divided in two parts, 51051 and 155551, that added together give a palindrome (206602).

The spelling of 51051155551 in words is "fifty-one billion, fifty-one million, one hundred fifty-five thousand, five hundred fifty-one".