51535442040 has 64 divisors (see below), whose sum is σ = 154625103360. Its totient is φ = 13741115520.

The previous prime is 51535441999. The next prime is 51535442059. The reversal of 51535442040 is 4024453515.

It is a junction number, because it is equal to n+sod(n) for n = 51535441992 and 51535442010.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1208685 + ... + 1250595.

It is an arithmetic number, because the mean of its divisors is an integer number (2416017240).

Almost surely, 2^51535442040 is an apocalyptic number.

It is an amenable number.

51535442040 is an abundant number, since it is smaller than the sum of its proper divisors (103089661320).

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

51535442040 is a wasteful number, since it uses less digits than its factorization.

51535442040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52172 (or 52168 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

Adding to 51535442040 its reverse (4024453515), we get a palindrome (55559895555).

The spelling of 51535442040 in words is "fifty-one billion, five hundred thirty-five million, four hundred forty-two thousand, forty".