78504338317523 has 2 divisors, whose sum is σ = 78504338317524. Its totient is φ = 78504338317522.

The previous prime is 78504338317499. The next prime is 78504338317577. The reversal of 78504338317523 is 32571383340587.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78504338317523 - 2¹⁶ = 78504338251987 is a prime.

It is a super-2 number, since 2×78504338317523² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78504338397523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39252169158761 + 39252169158762.

It is an arithmetic number, because the mean of its divisors is an integer number (39252169158762).

Almost surely, 2^{78504338317523} is an apocalyptic number.

78504338317523 is a deficient number, since it is larger than the sum of its proper divisors (1).

78504338317523 is an equidigital number, since it uses as much as digits as its factorization.

78504338317523 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 50803200, while the sum is 59.

The spelling of 78504338317523 in words is "seventy-eight trillion, five hundred four billion, three hundred thirty-eight million, three hundred seventeen thousand, five hundred twenty-three".