51585078277 has 4 divisors (see below), whose sum is σ = 51670910956. Its totient is φ = 51499245600.

The previous prime is 51585078191. The next prime is 51585078289. The reversal of 51585078277 is 77287058515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77287058515 = 5 ⋅15457411703.

It can be written as a sum of positive squares in 2 ways, for example, as 38405808676 + 13179269601 = 195974^2 + 114801^2 .

It is a cyclic number.

It is not a de Polignac number, because 51585078277 - 2¹⁵ = 51585045509 is a prime.

It is a super-2 number, since 2×51585078277² (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 (51585078977) 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, 42915438 + ... + 42916639.

It is an arithmetic number, because the mean of its divisors is an integer number (12917727739).

Almost surely, 2^51585078277 is an apocalyptic number.

It is an amenable number.

51585078277 is a deficient number, since it is larger than the sum of its proper divisors (85832679).

51585078277 is an equidigital number, since it uses as much as digits as its factorization.

51585078277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85832678.

The product of its (nonzero) digits is 5488000, while the sum is 55.

The spelling of 51585078277 in words is "fifty-one billion, five hundred eighty-five million, seventy-eight thousand, two hundred seventy-seven".