78465740863873 has 4 divisors (see below), whose sum is σ = 85598990033328. Its totient is φ = 71332491694420.

The previous prime is 78465740863831. The next prime is 78465740863957. The reversal of 78465740863873 is 37836804756487.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 78465740863873 - 2⁹ = 78465740863361 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78465740863873.

It is not an unprimeable number, because it can be changed into a prime (78465740863073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3566624584711 + ... + 3566624584732.

It is an arithmetic number, because the mean of its divisors is an integer number (21399747508332).

Almost surely, 2^{78465740863873} is an apocalyptic number.

It is an amenable number.

78465740863873 is a deficient number, since it is larger than the sum of its proper divisors (7133249169455).

78465740863873 is a wasteful number, since it uses less digits than its factorization.

78465740863873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7133249169454.

The product of its (nonzero) digits is 4551966720, while the sum is 76.

The spelling of 78465740863873 in words is "seventy-eight trillion, four hundred sixty-five billion, seven hundred forty million, eight hundred sixty-three thousand, eight hundred seventy-three".