51111455240 has 32 divisors (see below), whose sum is σ = 117170605080. Its totient is φ = 20058834432.

The previous prime is 51111455203. The next prime is 51111455261. The reversal of 51111455240 is 4255411115.

It can be written as a sum of positive squares in 4 ways, for example, as 33703819396 + 17407635844 = 183586^2 + 131938^2 .

It is a super-2 number, since 2×51111455240² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12052469 + ... + 12056708.

Almost surely, 2^51111455240 is an apocalyptic number.

It is an amenable number.

51111455240 is an abundant number, since it is smaller than the sum of its proper divisors (66059149840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51111455240 is a wasteful number, since it uses less digits than its factorization.

51111455240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24109241 (or 24109237 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 29.

Adding to 51111455240 its reverse (4255411115), we get a palindrome (55366866355).

The spelling of 51111455240 in words is "fifty-one billion, one hundred eleven million, four hundred fifty-five thousand, two hundred forty".