51224224540 has 48 divisors (see below), whose sum is σ = 112140451584. Its totient is φ = 19632384000.

The previous prime is 51224224477. The next prime is 51224224547. The reversal of 51224224540 is 4542242215.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51224224547) 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, 346389 + ... + 471628.

It is an arithmetic number, because the mean of its divisors is an integer number (2336259408).

Almost surely, 2^51224224540 is an apocalyptic number.

It is an amenable number.

51224224540 is an abundant number, since it is smaller than the sum of its proper divisors (60916227044).

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

51224224540 is a wasteful number, since it uses less digits than its factorization.

51224224540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 818158 (or 818156 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 31.

Adding to 51224224540 its reverse (4542242215), we get a palindrome (55766466755).

The spelling of 51224224540 in words is "fifty-one billion, two hundred twenty-four million, two hundred twenty-four thousand, five hundred forty".