51505550015611 has 2 divisors, whose sum is σ = 51505550015612. Its totient is φ = 51505550015610.

The previous prime is 51505550015609. The next prime is 51505550015617. The reversal of 51505550015611 is 11651005550515.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51505550015611 - 2¹ = 51505550015609 is a prime.

Together with 51505550015609, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51505550015617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25752775007805 + 25752775007806.

It is an arithmetic number, because the mean of its divisors is an integer number (25752775007806).

Almost surely, 2^{51505550015611} is an apocalyptic number.

51505550015611 is a deficient number, since it is larger than the sum of its proper divisors (1).

51505550015611 is an equidigital number, since it uses as much as digits as its factorization.

51505550015611 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93750, while the sum is 40.

The spelling of 51505550015611 in words is "fifty-one trillion, five hundred five billion, five hundred fifty million, fifteen thousand, six hundred eleven".