51379842865 has 8 divisors (see below), whose sum is σ = 66398566248. Its totient is φ = 37942037760.

The previous prime is 51379842863. The next prime is 51379842887. The reversal of 51379842865 is 56824897315.

It can be written as a sum of positive squares in 4 ways, for example, as 2227179249 + 49152663616 = 47193^2 + 221704^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 51379842865 - 2¹ = 51379842863 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51379842863) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395229496 + ... + 395229625.

It is an arithmetic number, because the mean of its divisors is an integer number (8299820781).

Almost surely, 2^51379842865 is an apocalyptic number.

It is an amenable number.

51379842865 is a deficient number, since it is larger than the sum of its proper divisors (15018723383).

51379842865 is a wasteful number, since it uses less digits than its factorization.

51379842865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 790459139.

The product of its digits is 14515200, while the sum is 58.

The spelling of 51379842865 in words is "fifty-one billion, three hundred seventy-nine million, eight hundred forty-two thousand, eight hundred sixty-five".