51606565670 has 32 divisors (see below), whose sum is σ = 103693201920. Its totient is φ = 18329603040.

The previous prime is 51606565649. The next prime is 51606565691. The reversal of 51606565670 is 7656560615.

It is an interprime number because it is at equal distance from previous prime (51606565649) and next prime (51606565691).

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5450510 + ... + 5459969.

It is an arithmetic number, because the mean of its divisors is an integer number (3240412560).

Almost surely, 2^51606565670 is an apocalyptic number.

51606565670 is an abundant number, since it is smaller than the sum of its proper divisors (52086636250).

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

51606565670 is a wasteful number, since it uses less digits than its factorization.

51606565670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10910540.

The product of its (nonzero) digits is 1134000, while the sum is 47.

The spelling of 51606565670 in words is "fifty-one billion, six hundred six million, five hundred sixty-five thousand, six hundred seventy".