51212063540 has 24 divisors (see below), whose sum is σ = 117322182432. Its totient is φ = 18622568480.

The previous prime is 51212063527. The next prime is 51212063569. The reversal of 51212063540 is 4536021215.

It is a congruent number.

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, 116390834 + ... + 116391273.

It is an arithmetic number, because the mean of its divisors is an integer number (4888424268).

Almost surely, 2^51212063540 is an apocalyptic number.

It is an amenable number.

51212063540 is an abundant number, since it is smaller than the sum of its proper divisors (66110118892).

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

51212063540 is a wasteful number, since it uses less digits than its factorization.

51212063540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232782127 (or 232782125 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 51212063540 its reverse (4536021215), we get a palindrome (55748084755).

The spelling of 51212063540 in words is "fifty-one billion, two hundred twelve million, sixty-three thousand, five hundred forty".