51500305069 has 4 divisors (see below), whose sum is σ = 52892205244. Its totient is φ = 50108404896.

The previous prime is 51500305061. The next prime is 51500305091. The reversal of 51500305069 is 96050300515.

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

It can be written as a sum of positive squares in 2 ways, for example, as 34424349444 + 17075955625 = 185538^2 + 130675^2 .

It is a cyclic number.

It is not a de Polignac number, because 51500305069 - 2³ = 51500305061 is a prime.

It is a super-2 number, since 2×51500305069² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51500305061) 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, 695950032 + ... + 695950105.

It is an arithmetic number, because the mean of its divisors is an integer number (13223051311).

Almost surely, 2^51500305069 is an apocalyptic number.

It is an amenable number.

51500305069 is a deficient number, since it is larger than the sum of its proper divisors (1391900175).

51500305069 is a wasteful number, since it uses less digits than its factorization.

51500305069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1391900174.

The product of its (nonzero) digits is 20250, while the sum is 34.

The spelling of 51500305069 in words is "fifty-one billion, five hundred million, three hundred five thousand, sixty-nine".