51906720220071 has 16 divisors (see below), whose sum is σ = 69911616106080. Its totient is φ = 34253323011200.

The previous prime is 51906720220001. The next prime is 51906720220079. The reversal of 51906720220071 is 17002202760915.

It is a cyclic number.

It is not a de Polignac number, because 51906720220071 - 2⁹ = 51906720219559 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 20128356 + ... + 22560233.

It is an arithmetic number, because the mean of its divisors is an integer number (4369476006630).

Almost surely, 2^{51906720220071} is an apocalyptic number.

51906720220071 is a deficient number, since it is larger than the sum of its proper divisors (18004895886009).

51906720220071 is a wasteful number, since it uses less digits than its factorization.

51906720220071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42692706.

The product of its (nonzero) digits is 105840, while the sum is 42.

Adding to 51906720220071 its reverse (17002202760915), we get a palindrome (68908922980986).

The spelling of 51906720220071 in words is "fifty-one trillion, nine hundred six billion, seven hundred twenty million, two hundred twenty thousand, seventy-one".