51540000769 has 4 divisors (see below), whose sum is σ = 51595007044. Its totient is φ = 51484994496.

The previous prime is 51540000763. The next prime is 51540000773. The reversal of 51540000769 is 96700004515.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96700004515 = 5 ⋅19340000903.

It can be written as a sum of positive squares in 2 ways, for example, as 31065825025 + 20474175744 = 176255^2 + 143088^2 .

It is a cyclic number.

It is not a de Polignac number, because 51540000769 - 2⁷ = 51540000641 is a prime.

It is a super-2 number, since 2×51540000769² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51540000763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27501732 + ... + 27503605.

It is an arithmetic number, because the mean of its divisors is an integer number (12898751761).

Almost surely, 2^51540000769 is an apocalyptic number.

51540000769 is the 131073-rd hex number.

It is an amenable number.

51540000769 is a deficient number, since it is larger than the sum of its proper divisors (55006275).

51540000769 is an equidigital number, since it uses as much as digits as its factorization.

51540000769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55006274.

The product of its (nonzero) digits is 37800, while the sum is 37.

The spelling of 51540000769 in words is "fifty-one billion, five hundred forty million, seven hundred sixty-nine", and thus it is an aban number.