78400555505023 has 2 divisors, whose sum is σ = 78400555505024. Its totient is φ = 78400555505022.

The previous prime is 78400555504991. The next prime is 78400555505099. The reversal of 78400555505023 is 32050555500487.

It is a weak prime.

It is an emirp because it is prime and its reverse (32050555500487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78400555505023 - 2⁵ = 78400555504991 is a prime.

It is a super-2 number, since 2×78400555505023² (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 (78400555505323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39200277752511 + 39200277752512.

It is an arithmetic number, because the mean of its divisors is an integer number (39200277752512).

Almost surely, 2^{78400555505023} is an apocalyptic number.

78400555505023 is a deficient number, since it is larger than the sum of its proper divisors (1).

78400555505023 is an equidigital number, since it uses as much as digits as its factorization.

78400555505023 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4200000, while the sum is 49.

The spelling of 78400555505023 in words is "seventy-eight trillion, four hundred billion, five hundred fifty-five million, five hundred five thousand, twenty-three".