51020315440 has 40 divisors (see below), whose sum is σ = 124865512560. Its totient is φ = 19334013696.

The previous prime is 51020315429. The next prime is 51020315443. The reversal of 51020315440 is 4451302015.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is not an unprimeable number, because it can be changed into a prime (51020315443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16781479 + ... + 16784518.

It is an arithmetic number, because the mean of its divisors is an integer number (3121637814).

Almost surely, 2^51020315440 is an apocalyptic number.

It is an amenable number.

51020315440 is an abundant number, since it is smaller than the sum of its proper divisors (73845197120).

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

51020315440 is a wasteful number, since it uses less digits than its factorization.

51020315440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33566029 (or 33566023 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 51020315440 its reverse (4451302015), we get a palindrome (55471617455).

The spelling of 51020315440 in words is "fifty-one billion, twenty million, three hundred fifteen thousand, four hundred forty".