51368450839 has 4 divisors (see below), whose sum is σ = 53139776760. Its totient is φ = 49597124920.

The previous prime is 51368450821. The next prime is 51368450851. The reversal of 51368450839 is 93805486315.

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 51368450839 - 2¹⁹ = 51367926551 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 (51368450039) 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, 885662917 + ... + 885662974.

It is an arithmetic number, because the mean of its divisors is an integer number (13284944190).

Almost surely, 2^51368450839 is an apocalyptic number.

51368450839 is a deficient number, since it is larger than the sum of its proper divisors (1771325921).

51368450839 is a wasteful number, since it uses less digits than its factorization.

51368450839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1771325920.

The product of its (nonzero) digits is 3110400, while the sum is 52.

The spelling of 51368450839 in words is "fifty-one billion, three hundred sixty-eight million, four hundred fifty thousand, eight hundred thirty-nine".