242720509357 has 4 divisors (see below), whose sum is σ = 256998186396. Its totient is φ = 228442832320.

The previous prime is 242720509313. The next prime is 242720509429. The reversal of 242720509357 is 753905027242.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 753905027242 = 2 ⋅376952513621.

It can be written as a sum of positive squares in 2 ways, for example, as 222185905956 + 20534603401 = 471366^2 + 143299^2 .

It is a cyclic number.

It is not a de Polignac number, because 242720509357 - 2¹⁵ = 242720476589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (242720504357) 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 in 3 ways as a sum of consecutive naturals, for example, 7138838494 + ... + 7138838527.

It is an arithmetic number, because the mean of its divisors is an integer number (64249546599).

Almost surely, 2^242720509357 is an apocalyptic number.

It is an amenable number.

242720509357 is a deficient number, since it is larger than the sum of its proper divisors (14277677039).

242720509357 is a wasteful number, since it uses less digits than its factorization.

242720509357 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14277677038.

The product of its (nonzero) digits is 1058400, while the sum is 46.

The spelling of 242720509357 in words is "two hundred forty-two billion, seven hundred twenty million, five hundred nine thousand, three hundred fifty-seven".