51516651565105 has 4 divisors (see below), whose sum is σ = 61819981878132. Its totient is φ = 41213321252080.

The previous prime is 51516651565103. The next prime is 51516651565109. The reversal of 51516651565105 is 50156515661515.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17942611600384 + 33574039964721 = 4235872^2 + 5794311^2 .

It is not a de Polignac number, because 51516651565105 - 2¹ = 51516651565103 is a prime.

It is a super-2 number, since 2×51516651565105² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51516651565103) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5151665156506 + ... + 5151665156515.

It is an arithmetic number, because the mean of its divisors is an integer number (15454995469533).

Almost surely, 2^{51516651565105} is an apocalyptic number.

It is an amenable number.

51516651565105 is a deficient number, since it is larger than the sum of its proper divisors (10303330313027).

51516651565105 is a wasteful number, since it uses less digits than its factorization.

51516651565105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10303330313026.

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

The spelling of 51516651565105 in words is "fifty-one trillion, five hundred sixteen billion, six hundred fifty-one million, five hundred sixty-five thousand, one hundred five".