51906720220069 has 32 divisors (see below), whose sum is σ = 61994057771520. Its totient is φ = 42840561355200.

The previous prime is 51906720220001. The next prime is 51906720220079. The reversal of 51906720220069 is 96002202760915.

It is a cyclic number.

It is not a de Polignac number, because 51906720220069 - 2³¹ = 51904572736421 is a prime.

It is a super-2 number, since 2×51906720220069² (a number of 28 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 (51906720220079) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10075947 + ... + 14329624.

It is an arithmetic number, because the mean of its divisors is an integer number (1937314305360).

Almost surely, 2^{51906720220069} is an apocalyptic number.

It is an amenable number.

51906720220069 is a deficient number, since it is larger than the sum of its proper divisors (10087337551451).

51906720220069 is a wasteful number, since it uses less digits than its factorization.

51906720220069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24405841.

The product of its (nonzero) digits is 816480, while the sum is 49.

The spelling of 51906720220069 in words is "fifty-one trillion, nine hundred six billion, seven hundred twenty million, two hundred twenty thousand, sixty-nine".