51521453256432 has 80 divisors (see below), whose sum is σ = 135366898464000. Its totient is φ = 16880998835712.

The previous prime is 51521453256409. The next prime is 51521453256461. The reversal of 51521453256432 is 23465235412515.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26734669 + ... + 28596947.

It is an arithmetic number, because the mean of its divisors is an integer number (1692086230800).

Almost surely, 2^{51521453256432} is an apocalyptic number.

It is an amenable number.

51521453256432 is an abundant number, since it is smaller than the sum of its proper divisors (83845445207568).

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

51521453256432 is a wasteful number, since it uses less digits than its factorization.

51521453256432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872118 (or 1872112 counting only the distinct ones).

The product of its digits is 4320000, while the sum is 48.

Adding to 51521453256432 its reverse (23465235412515), we get a palindrome (74986688668947).

The spelling of 51521453256432 in words is "fifty-one trillion, five hundred twenty-one billion, four hundred fifty-three million, two hundred fifty-six thousand, four hundred thirty-two".