51105240040 has 64 divisors (see below), whose sum is σ = 116214336000. Its totient is φ = 20225002752.

The previous prime is 51105239971. The next prime is 51105240049. The reversal of 51105240040 is 4004250115.

51105240040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×51105240040² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51105239993 and 51105240020.

It is not an unprimeable number, because it can be changed into a prime (51105240049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1436386 + ... + 1471534.

It is an arithmetic number, because the mean of its divisors is an integer number (1815849000).

Almost surely, 2^51105240040 is an apocalyptic number.

It is an amenable number.

51105240040 is an abundant number, since it is smaller than the sum of its proper divisors (65109095960).

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

51105240040 is a wasteful number, since it uses less digits than its factorization.

51105240040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35546 (or 35542 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

Adding to 51105240040 its reverse (4004250115), we get a palindrome (55109490155).

The spelling of 51105240040 in words is "fifty-one billion, one hundred five million, two hundred forty thousand, forty".