51678751765653 has 6 divisors (see below), whose sum is σ = 74647085883734. Its totient is φ = 34452501177096.

The previous prime is 51678751765559. The next prime is 51678751765691. The reversal of 51678751765653 is 35656715787615.

51678751765653 is a `hidden beast` number, since 5 + 1 + 6 + 7 + 8 + 7 + 51 + 7 + 6 + 565 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 46841184659844 + 4837567105809 = 6844062^2 + 2199447^2 .

It is not a de Polignac number, because 51678751765653 - 2⁸ = 51678751765397 is a prime.

It is a super-3 number, since 3×51678751765653³ (a number of 42 digits) contains 333 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 (51678751760653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2871041764750 + ... + 2871041764767.

Almost surely, 2^{51678751765653} is an apocalyptic number.

It is an amenable number.

51678751765653 is a deficient number, since it is larger than the sum of its proper divisors (22968334118081).

51678751765653 is a wasteful number, since it uses less digits than its factorization.

51678751765653 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5742083529523 (or 5742083529520 counting only the distinct ones).

The product of its digits is 1111320000, while the sum is 72.

The spelling of 51678751765653 in words is "fifty-one trillion, six hundred seventy-eight billion, seven hundred fifty-one million, seven hundred sixty-five thousand, six hundred fifty-three".