51605606121 has 4 divisors (see below), whose sum is σ = 68807474832. Its totient is φ = 34403737412.

The previous prime is 51605606099. The next prime is 51605606137. The reversal of 51605606121 is 12160650615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51605606121 - 2⁶ = 51605606057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51605606191) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 8600934351 + ... + 8600934356.

It is an arithmetic number, because the mean of its divisors is an integer number (17201868708).

Almost surely, 2^51605606121 is an apocalyptic number.

It is an amenable number.

51605606121 is a deficient number, since it is larger than the sum of its proper divisors (17201868711).

51605606121 is a wasteful number, since it uses less digits than its factorization.

51605606121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17201868710.

The product of its (nonzero) digits is 10800, while the sum is 33.

The spelling of 51605606121 in words is "fifty-one billion, six hundred five million, six hundred six thousand, one hundred twenty-one".