51161661606 has 16 divisors (see below), whose sum is σ = 111625443648. Its totient is φ = 15503533800.

The previous prime is 51161661599. The next prime is 51161661643. The reversal of 51161661606 is 60616616115.

It is a Curzon number.

It is a congruent number.

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, 387588280 + ... + 387588411.

It is an arithmetic number, because the mean of its divisors is an integer number (6976590228).

Almost surely, 2^51161661606 is an apocalyptic number.

51161661606 is an abundant number, since it is smaller than the sum of its proper divisors (60463782042).

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

51161661606 is a wasteful number, since it uses less digits than its factorization.

51161661606 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775176707.

The product of its (nonzero) digits is 38880, while the sum is 39.

It can be divided in two parts, 5 and 1161661606, that added together give a palindrome (1161661611).

The spelling of 51161661606 in words is "fifty-one billion, one hundred sixty-one million, six hundred sixty-one thousand, six hundred six".