78826642120573 has 2 divisors, whose sum is σ = 78826642120574. Its totient is φ = 78826642120572.

The previous prime is 78826642120469. The next prime is 78826642120579. The reversal of 78826642120573 is 37502124662887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39997567355769 + 38829074764804 = 6324363^2 + 6231298^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78826642120573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78826642120579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39413321060286 + 39413321060287.

It is an arithmetic number, because the mean of its divisors is an integer number (39413321060287).

Almost surely, 2^{78826642120573} is an apocalyptic number.

It is an amenable number.

78826642120573 is a deficient number, since it is larger than the sum of its proper divisors (1).

78826642120573 is an equidigital number, since it uses as much as digits as its factorization.

78826642120573 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 54190080, while the sum is 61.

The spelling of 78826642120573 in words is "seventy-eight trillion, eight hundred twenty-six billion, six hundred forty-two million, one hundred twenty thousand, five hundred seventy-three".