51601155565 has 16 divisors (see below), whose sum is σ = 62390059200. Its totient is φ = 40968698112.

The previous prime is 51601155559. The next prime is 51601155601. The reversal of 51601155565 is 56555110615.

51601155565 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51601155565 - 2²⁹ = 51064284653 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2085909 + ... + 2110501.

It is an arithmetic number, because the mean of its divisors is an integer number (3899378700).

Almost surely, 2^51601155565 is an apocalyptic number.

It is an amenable number.

51601155565 is a deficient number, since it is larger than the sum of its proper divisors (10788903635).

51601155565 is a wasteful number, since it uses less digits than its factorization.

51601155565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27756.

The product of its (nonzero) digits is 112500, while the sum is 40.

The spelling of 51601155565 in words is "fifty-one billion, six hundred one million, one hundred fifty-five thousand, five hundred sixty-five".