51613635665 has 32 divisors (see below), whose sum is σ = 63830633472. Its totient is φ = 40049856000.

The previous prime is 51613635649. The next prime is 51613635673. The reversal of 51613635665 is 56653631615.

It is a happy number.

It is not a de Polignac number, because 51613635665 - 2⁴ = 51613635649 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 (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11167055 + ... + 11171675.

It is an arithmetic number, because the mean of its divisors is an integer number (1994707296).

Almost surely, 2^51613635665 is an apocalyptic number.

It is an amenable number.

51613635665 is a deficient number, since it is larger than the sum of its proper divisors (12216997807).

51613635665 is a wasteful number, since it uses less digits than its factorization.

51613635665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5201.

The product of its digits is 1458000, while the sum is 47.

The spelling of 51613635665 in words is "fifty-one billion, six hundred thirteen million, six hundred thirty-five thousand, six hundred sixty-five".