51665505155191 has 2 divisors, whose sum is σ = 51665505155192. Its totient is φ = 51665505155190.

The previous prime is 51665505155107. The next prime is 51665505155213. The reversal of 51665505155191 is 19155150556615.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51665505155191 - 2¹³ = 51665505146999 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51665505155291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25832752577595 + 25832752577596.

It is an arithmetic number, because the mean of its divisors is an integer number (25832752577596).

Almost surely, 2^{51665505155191} is an apocalyptic number.

51665505155191 is a deficient number, since it is larger than the sum of its proper divisors (1).

51665505155191 is an equidigital number, since it uses as much as digits as its factorization.

51665505155191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5062500, while the sum is 55.

The spelling of 51665505155191 in words is "fifty-one trillion, six hundred sixty-five billion, five hundred five million, one hundred fifty-five thousand, one hundred ninety-one".