51265403340 has 96 divisors (see below), whose sum is σ = 149958466560. Its totient is φ = 13061174016.

The previous prime is 51265403281. The next prime is 51265403353. The reversal of 51265403340 is 4330456215.

It is a super-2 number, since 2×51265403340² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1189081 + ... + 1231439.

It is an arithmetic number, because the mean of its divisors is an integer number (1562067360).

Almost surely, 2^51265403340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51265403340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74979233280).

51265403340 is an abundant number, since it is smaller than the sum of its proper divisors (98693063220).

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

51265403340 is a wasteful number, since it uses less digits than its factorization.

51265403340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43271 (or 43269 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

Adding to 51265403340 its reverse (4330456215), we get a palindrome (55595859555).

The spelling of 51265403340 in words is "fifty-one billion, two hundred sixty-five million, four hundred three thousand, three hundred forty".