51605903946 has 16 divisors (see below), whose sum is σ = 103214034144. Its totient is φ = 17201596944.

The previous prime is 51605903929. The next prime is 51605903959. The reversal of 51605903946 is 64930950615.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 51605903895 and 51605903904.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498136 + ... + 592748.

It is an arithmetic number, because the mean of its divisors is an integer number (6450877134).

Almost surely, 2^51605903946 is an apocalyptic number.

51605903946 is an abundant number, since it is smaller than the sum of its proper divisors (51608130198).

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

51605903946 is a wasteful number, since it uses less digits than its factorization.

51605903946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185525.

The product of its (nonzero) digits is 874800, while the sum is 48.

The spelling of 51605903946 in words is "fifty-one billion, six hundred five million, nine hundred three thousand, nine hundred forty-six".