51025120040 has 64 divisors (see below), whose sum is σ = 119857795200. Its totient is φ = 19512928512.

The previous prime is 51025120019. The next prime is 51025120049. The reversal of 51025120040 is 4002152015.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 51025119994 and 51025120021.

It is not an unprimeable number, because it can be changed into a prime (51025120049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1991954 + ... + 2017406.

It is an arithmetic number, because the mean of its divisors is an integer number (1872778050).

Almost surely, 2^51025120040 is an apocalyptic number.

It is an amenable number.

51025120040 is an abundant number, since it is smaller than the sum of its proper divisors (68832675160).

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

51025120040 is a wasteful number, since it uses less digits than its factorization.

51025120040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27666 (or 27662 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 20.

Adding to 51025120040 its reverse (4002152015), we get a palindrome (55027272055).

The spelling of 51025120040 in words is "fifty-one billion, twenty-five million, one hundred twenty thousand, forty".