78053061030557 has 2 divisors, whose sum is σ = 78053061030558. Its totient is φ = 78053061030556.

The previous prime is 78053061030517. The next prime is 78053061030577. The reversal of 78053061030557 is 75503016035087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 68850265331236 + 9202795699321 = 8297606^2 + 3033611^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78053061030557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78053061030517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39026530515278 + 39026530515279.

It is an arithmetic number, because the mean of its divisors is an integer number (39026530515279).

Almost surely, 2^{78053061030557} is an apocalyptic number.

It is an amenable number.

78053061030557 is a deficient number, since it is larger than the sum of its proper divisors (1).

78053061030557 is an equidigital number, since it uses as much as digits as its factorization.

78053061030557 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2646000, while the sum is 50.

The spelling of 78053061030557 in words is "seventy-eight trillion, fifty-three billion, sixty-one million, thirty thousand, five hundred fifty-seven".