78504338317577 has 2 divisors, whose sum is σ = 78504338317578. Its totient is φ = 78504338317576.

The previous prime is 78504338317523. The next prime is 78504338317579. The reversal of 78504338317577 is 77571383340587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76284345596281 + 2219992721296 = 8734091^2 + 1489964^2 .

It is a cyclic number.

It is not a de Polignac number, because 78504338317577 - 2³⁰ = 78503264575753 is a prime.

It is a super-2 number, since 2×78504338317577² (a number of 29 digits) contains 22 as substring.

Together with 78504338317579, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78504338317579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39252169158788 + 39252169158789.

It is an arithmetic number, because the mean of its divisors is an integer number (39252169158789).

Almost surely, 2^{78504338317577} is an apocalyptic number.

It is an amenable number.

78504338317577 is a deficient number, since it is larger than the sum of its proper divisors (1).

78504338317577 is an equidigital number, since it uses as much as digits as its factorization.

78504338317577 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 414892800, while the sum is 68.

The spelling of 78504338317577 in words is "seventy-eight trillion, five hundred four billion, three hundred thirty-eight million, three hundred seventeen thousand, five hundred seventy-seven".