51242255541 has 24 divisors (see below), whose sum is σ = 76785934680. Its totient is φ = 32890023936.

The previous prime is 51242255531. The next prime is 51242255543. The reversal of 51242255541 is 14555224215.

51242255541 is a `hidden beast` number, since 51 + 2 + 42 + 25 + 5 + 541 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 5399163441 + 45843092100 = 73479^2 + 214110^2 .

It is not a de Polignac number, because 51242255541 - 2⁷ = 51242255413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 51242255496 and 51242255505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51242255543) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 185956 + ... + 370221.

It is an arithmetic number, because the mean of its divisors is an integer number (3199413945).

Almost surely, 2^51242255541 is an apocalyptic number.

It is an amenable number.

51242255541 is a deficient number, since it is larger than the sum of its proper divisors (25543679139).

51242255541 is a wasteful number, since it uses less digits than its factorization.

51242255541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556565 (or 556562 counting only the distinct ones).

The product of its digits is 80000, while the sum is 36.

Adding to 51242255541 its reverse (14555224215), we get a palindrome (65797479756).

The spelling of 51242255541 in words is "fifty-one billion, two hundred forty-two million, two hundred fifty-five thousand, five hundred forty-one".