51077342687681 has 4 divisors (see below), whose sum is σ = 52323131533764. Its totient is φ = 49831553841600.

The previous prime is 51077342687647. The next prime is 51077342687687. The reversal of 51077342687681 is 18678624377015.

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 13557013540225 + 37520329147456 = 3681985^2 + 6125384^2 .

It is a cyclic number.

It is not a de Polignac number, because 51077342687681 - 2⁶ = 51077342687617 is a prime.

It is a super-2 number, since 2×51077342687681² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51077342687687) 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, 622894422980 + ... + 622894423061.

It is an arithmetic number, because the mean of its divisors is an integer number (13080782883441).

Almost surely, 2^{51077342687681} is an apocalyptic number.

It is an amenable number.

51077342687681 is a deficient number, since it is larger than the sum of its proper divisors (1245788846083).

51077342687681 is a wasteful number, since it uses less digits than its factorization.

51077342687681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245788846082.

The product of its (nonzero) digits is 94832640, while the sum is 65.

The spelling of 51077342687681 in words is "fifty-one trillion, seventy-seven billion, three hundred forty-two million, six hundred eighty-seven thousand, six hundred eighty-one".