51515665667065 has 8 divisors (see below), whose sum is σ = 62418981313728. Its totient is φ = 40812410858160.

The previous prime is 51515665667041. The next prime is 51515665667143. The reversal of 51515665667065 is 56076656651515.

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 51515665667065 - 2¹⁷ = 51515665535993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51515665666988 and 51515665667006.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50015208871 + ... + 50015209900.

It is an arithmetic number, because the mean of its divisors is an integer number (7802372664216).

Almost surely, 2^{51515665667065} is an apocalyptic number.

It is an amenable number.

51515665667065 is a deficient number, since it is larger than the sum of its proper divisors (10903315646663).

51515665667065 is a wasteful number, since it uses less digits than its factorization.

51515665667065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100030418879.

The product of its (nonzero) digits is 170100000, while the sum is 64.

The spelling of 51515665667065 in words is "fifty-one trillion, five hundred fifteen billion, six hundred sixty-five million, six hundred sixty-seven thousand, sixty-five".