78242511505573 has 2 divisors, whose sum is σ = 78242511505574. Its totient is φ = 78242511505572.

The previous prime is 78242511505559. The next prime is 78242511505619. The reversal of 78242511505573 is 37550511524287.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40872788871489 + 37369722634084 = 6393183^2 + 6113078^2 .

It is a cyclic number.

It is not a de Polignac number, because 78242511505573 - 2⁴¹ = 76043488250021 is a prime.

It is a super-2 number, since 2×78242511505573² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78242511545573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39121255752786 + 39121255752787.

It is an arithmetic number, because the mean of its divisors is an integer number (39121255752787).

Almost surely, 2^{78242511505573} is an apocalyptic number.

It is an amenable number.

78242511505573 is a deficient number, since it is larger than the sum of its proper divisors (1).

78242511505573 is an equidigital number, since it uses as much as digits as its factorization.

78242511505573 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760000, while the sum is 55.

The spelling of 78242511505573 in words is "seventy-eight trillion, two hundred forty-two billion, five hundred eleven million, five hundred five thousand, five hundred seventy-three".