242720504357 has 2 divisors, whose sum is σ = 242720504358. Its totient is φ = 242720504356.

The previous prime is 242720504267. The next prime is 242720504413. The reversal of 242720504357 is 753405027242.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 124570878916 + 118149625441 = 352946^2 + 343729^2 .

It is a cyclic number.

It is not a de Polignac number, because 242720504357 - 2⁸ = 242720504101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (242720507357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 121360252178 + 121360252179.

It is an arithmetic number, because the mean of its divisors is an integer number (121360252179).

Almost surely, 2^242720504357 is an apocalyptic number.

It is an amenable number.

242720504357 is a deficient number, since it is larger than the sum of its proper divisors (1).

242720504357 is an equidigital number, since it uses as much as digits as its factorization.

242720504357 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 470400, while the sum is 41.

The spelling of 242720504357 in words is "two hundred forty-two billion, seven hundred twenty million, five hundred four thousand, three hundred fifty-seven".