51655110651565 has 8 divisors (see below), whose sum is σ = 64681182033408. Its totient is φ = 39527389020240.

The previous prime is 51655110651563. The next prime is 51655110651631. The reversal of 51655110651565 is 56515601155615.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51655110651565 - 2¹ = 51655110651563 is a prime.

It is a super-4 number, since 4×51655110651565⁴ (a number of 56 digits) contains 4444 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51655110651563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224587437501 + ... + 224587437730.

It is an arithmetic number, because the mean of its divisors is an integer number (8085147754176).

Almost surely, 2^{51655110651565} is an apocalyptic number.

It is an amenable number.

51655110651565 is a deficient number, since it is larger than the sum of its proper divisors (13026071381843).

51655110651565 is a wasteful number, since it uses less digits than its factorization.

51655110651565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449174875259.

The product of its (nonzero) digits is 3375000, while the sum is 52.

The spelling of 51655110651565 in words is "fifty-one trillion, six hundred fifty-five billion, one hundred ten million, six hundred fifty-one thousand, five hundred sixty-five".