51563431242 has 24 divisors (see below), whose sum is σ = 112136097060. Its totient is φ = 17123913600.

The previous prime is 51563431223. The next prime is 51563431259. The reversal of 51563431242 is 24213436515.

51563431242 is a `hidden beast` number, since 5 + 1 + 5 + 634 + 3 + 12 + 4 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 51529454001 + 33977241 = 227001^2 + 5829^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51563431197 and 51563431206.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5319759 + ... + 5329442.

Almost surely, 2^51563431242 is an apocalyptic number.

51563431242 is an abundant number, since it is smaller than the sum of its proper divisors (60572665818).

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

51563431242 is a wasteful number, since it uses less digits than its factorization.

51563431242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10649478 (or 10649475 counting only the distinct ones).

The product of its digits is 86400, while the sum is 36.

Adding to 51563431242 its reverse (24213436515), we get a palindrome (75776867757).

The spelling of 51563431242 in words is "fifty-one billion, five hundred sixty-three million, four hundred thirty-one thousand, two hundred forty-two".