51961255942543 has 2 divisors, whose sum is σ = 51961255942544. Its totient is φ = 51961255942542.

The previous prime is 51961255942489. The next prime is 51961255942567. The reversal of 51961255942543 is 34524955216915.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51961255942543 - 2⁹ = 51961255942031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51961255912543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25980627971271 + 25980627971272.

It is an arithmetic number, because the mean of its divisors is an integer number (25980627971272).

Almost surely, 2^{51961255942543} is an apocalyptic number.

51961255942543 is a deficient number, since it is larger than the sum of its proper divisors (1).

51961255942543 is an equidigital number, since it uses as much as digits as its factorization.

51961255942543 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58320000, while the sum is 61.

The spelling of 51961255942543 in words is "fifty-one trillion, nine hundred sixty-one billion, two hundred fifty-five million, nine hundred forty-two thousand, five hundred forty-three".