51402440252 has 48 divisors (see below), whose sum is σ = 96259218048. Its totient is φ = 23932339200.

The previous prime is 51402440251. The next prime is 51402440263. The reversal of 51402440252 is 25204420415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51402440251) 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, 17560013 + ... + 17562939.

It is an arithmetic number, because the mean of its divisors is an integer number (2005400376).

Almost surely, 2^51402440252 is an apocalyptic number.

It is an amenable number.

51402440252 is a deficient number, since it is larger than the sum of its proper divisors (44856777796).

51402440252 is a wasteful number, since it uses less digits than its factorization.

51402440252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5606 (or 5604 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 29.

Adding to 51402440252 its reverse (25204420415), we get a palindrome (76606860667).

The spelling of 51402440252 in words is "fifty-one billion, four hundred two million, four hundred forty thousand, two hundred fifty-two".