51854387439 has 4 divisors (see below), whose sum is σ = 69139183256. Its totient is φ = 34569591624.

The previous prime is 51854387419. The next prime is 51854387461. The reversal of 51854387439 is 93478345815.

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

It is not a de Polignac number, because 51854387439 - 2⁷ = 51854387311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51854387419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8642397904 + ... + 8642397909.

It is an arithmetic number, because the mean of its divisors is an integer number (17284795814).

Almost surely, 2^51854387439 is an apocalyptic number.

51854387439 is a deficient number, since it is larger than the sum of its proper divisors (17284795817).

51854387439 is a wasteful number, since it uses less digits than its factorization.

51854387439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17284795816.

The product of its digits is 14515200, while the sum is 57.

The spelling of 51854387439 in words is "fifty-one billion, eight hundred fifty-four million, three hundred eighty-seven thousand, four hundred thirty-nine".