51601665605 has 16 divisors (see below), whose sum is σ = 72413768064. Its totient is φ = 34561114560.

The previous prime is 51601665589. The next prime is 51601665611. The reversal of 51601665605 is 50656610615.

It is not a de Polignac number, because 51601665605 - 2⁴ = 51601665589 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 17141906 + ... + 17144915.

It is an arithmetic number, because the mean of its divisors is an integer number (4525860504).

Almost surely, 2^51601665605 is an apocalyptic number.

It is an amenable number.

51601665605 is a deficient number, since it is larger than the sum of its proper divisors (20812102459).

51601665605 is a wasteful number, since it uses less digits than its factorization.

51601665605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34286876.

The product of its (nonzero) digits is 162000, while the sum is 41.

The spelling of 51601665605 in words is "fifty-one billion, six hundred one million, six hundred sixty-five thousand, six hundred five".