51625087505 has 4 divisors (see below), whose sum is σ = 61950105012. Its totient is φ = 41300070000.

The previous prime is 51625087469. The next prime is 51625087523. The reversal of 51625087505 is 50578052615.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13621924369 + 38003163136 = 116713^2 + 194944^2 .

It is not a de Polignac number, because 51625087505 - 2¹⁶ = 51625021969 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5162508746 + ... + 5162508755.

It is an arithmetic number, because the mean of its divisors is an integer number (15487526253).

Almost surely, 2^51625087505 is an apocalyptic number.

It is an amenable number.

51625087505 is a deficient number, since it is larger than the sum of its proper divisors (10325017507).

51625087505 is a wasteful number, since it uses less digits than its factorization.

51625087505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10325017506.

The product of its (nonzero) digits is 420000, while the sum is 44.

The spelling of 51625087505 in words is "fifty-one billion, six hundred twenty-five million, eighty-seven thousand, five hundred five".