51386206191 has 16 divisors (see below), whose sum is σ = 69278823264. Its totient is φ = 33876117504.

The previous prime is 51386206181. The next prime is 51386206199. The reversal of 51386206191 is 19160268315.

It is not a de Polignac number, because 51386206191 - 2⁵ = 51386206159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51386206199) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 280195 + ... + 425771.

It is an arithmetic number, because the mean of its divisors is an integer number (4329926454).

Almost surely, 2^51386206191 is an apocalyptic number.

51386206191 is a deficient number, since it is larger than the sum of its proper divisors (17892617073).

51386206191 is a wasteful number, since it uses less digits than its factorization.

51386206191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146890.

The product of its (nonzero) digits is 77760, while the sum is 42.

The spelling of 51386206191 in words is "fifty-one billion, three hundred eighty-six million, two hundred six thousand, one hundred ninety-one".