51486516771 has 4 divisors (see below), whose sum is σ = 68648689032. Its totient is φ = 34324344512.

The previous prime is 51486516629. The next prime is 51486516773. The reversal of 51486516771 is 17761568415.

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

It is a cyclic number.

It is not a de Polignac number, because 51486516771 - 2²⁷ = 51352299043 is a prime.

It is a super-2 number, since 2×51486516771² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51486516773) 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, 8581086126 + ... + 8581086131.

It is an arithmetic number, because the mean of its divisors is an integer number (17162172258).

Almost surely, 2^51486516771 is an apocalyptic number.

51486516771 is a deficient number, since it is larger than the sum of its proper divisors (17162172261).

51486516771 is a wasteful number, since it uses less digits than its factorization.

51486516771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17162172260.

The product of its digits is 1411200, while the sum is 51.

The spelling of 51486516771 in words is "fifty-one billion, four hundred eighty-six million, five hundred sixteen thousand, seven hundred seventy-one".