51515304444 has 18 divisors (see below), whose sum is σ = 130219241880. Its totient is φ = 17171768136.

The previous prime is 51515304437. The next prime is 51515304479. The reversal of 51515304444 is 44440351515.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×51515304444² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1430980679 = 51515304444 / (5 + 1 + 5 + 1 + 5 + 3 + 0 + 4 + 4 + 4 + 4).

It is a junction number, because it is equal to n+sod(n) for n = 51515304399 and 51515304408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 715490304 + ... + 715490375.

Almost surely, 2^51515304444 is an apocalyptic number.

It is an amenable number.

51515304444 is an abundant number, since it is smaller than the sum of its proper divisors (78703937436).

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

51515304444 is a wasteful number, since it uses less digits than its factorization.

51515304444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430980689 (or 1430980684 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 36.

Adding to 51515304444 its reverse (44440351515), we get a palindrome (95955655959).

The spelling of 51515304444 in words is "fifty-one billion, five hundred fifteen million, three hundred four thousand, four hundred forty-four".