51155560565 has 32 divisors (see below), whose sum is σ = 62584292736. Its totient is φ = 40134447360.

The previous prime is 51155560553. The next prime is 51155560583. The reversal of 51155560565 is 56506555115.

It is not a de Polignac number, because 51155560565 - 2⁴ = 51155560549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 64184747 + ... + 64185543.

It is an arithmetic number, because the mean of its divisors is an integer number (1955759148).

Almost surely, 2^51155560565 is an apocalyptic number.

It is an amenable number.

51155560565 is a deficient number, since it is larger than the sum of its proper divisors (11428732171).

51155560565 is a wasteful number, since it uses less digits than its factorization.

51155560565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829.

The product of its (nonzero) digits is 562500, while the sum is 44.

The spelling of 51155560565 in words is "fifty-one billion, one hundred fifty-five million, five hundred sixty thousand, five hundred sixty-five".