51505006506 has 16 divisors (see below), whose sum is σ = 103013684064. Its totient is φ = 17167723664.

The previous prime is 51505006499. The next prime is 51505006519. The reversal of 51505006506 is 60560050515.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50185 + ... + 324851.

It is an arithmetic number, because the mean of its divisors is an integer number (6438355254).

Almost surely, 2^51505006506 is an apocalyptic number.

51505006506 is an abundant number, since it is smaller than the sum of its proper divisors (51508677558).

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

51505006506 is a wasteful number, since it uses less digits than its factorization.

51505006506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305925.

The product of its (nonzero) digits is 22500, while the sum is 33.

The spelling of 51505006506 in words is "fifty-one billion, five hundred five million, six thousand, five hundred six".