51223225253440 has 56 divisors (see below), whose sum is σ = 121995101378880. Its totient is φ = 20485964748288.

The previous prime is 51223225253281. The next prime is 51223225253489. The reversal of 51223225253440 is 4435252232215.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 51223225253393 and 51223225253402.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11014420 + ... + 14958739.

Almost surely, 2^{51223225253440} is an apocalyptic number.

It is an amenable number.

51223225253440 is an abundant number, since it is smaller than the sum of its proper divisors (70771876125440).

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

51223225253440 is a wasteful number, since it uses less digits than its factorization.

51223225253440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25979339 (or 25979329 counting only the distinct ones).

The product of its (nonzero) digits is 576000, while the sum is 40.

Adding to 51223225253440 its reverse (4435252232215), we get a palindrome (55658477485655).

The spelling of 51223225253440 in words is "fifty-one trillion, two hundred twenty-three billion, two hundred twenty-five million, two hundred fifty-three thousand, four hundred forty".