51539645086 has 4 divisors (see below), whose sum is σ = 77309467632. Its totient is φ = 25769822542.

The previous prime is 51539645083. The next prime is 51539645099. The reversal of 51539645086 is 68054693515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 68054693515 = 5 ⋅13610938703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51539645083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12884911270 + ... + 12884911273.

It is an arithmetic number, because the mean of its divisors is an integer number (19327366908).

Almost surely, 2^51539645086 is an apocalyptic number.

51539645086 is a deficient number, since it is larger than the sum of its proper divisors (25769822546).

51539645086 is a wasteful number, since it uses less digits than its factorization.

51539645086 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25769822545.

The product of its (nonzero) digits is 3888000, while the sum is 52.

The spelling of 51539645086 in words is "fifty-one billion, five hundred thirty-nine million, six hundred forty-five thousand, eighty-six".