78310503105785 has 4 divisors (see below), whose sum is σ = 93972603726948. Its totient is φ = 62648402484624.

The previous prime is 78310503105763. The next prime is 78310503105811. The reversal of 78310503105785 is 58750130501387.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30976048065769 + 47334455040016 = 5565613^2 + 6880004^2 .

It is a cyclic number.

It is not a de Polignac number, because 78310503105785 - 2²² = 78310498911481 is a prime.

It is a super-2 number, since 2×78310503105785² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7831050310574 + ... + 7831050310583.

It is an arithmetic number, because the mean of its divisors is an integer number (23493150931737).

Almost surely, 2^{78310503105785} is an apocalyptic number.

It is an amenable number.

78310503105785 is a deficient number, since it is larger than the sum of its proper divisors (15662100621163).

78310503105785 is a wasteful number, since it uses less digits than its factorization.

78310503105785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15662100621162.

The product of its (nonzero) digits is 3528000, while the sum is 53.

The spelling of 78310503105785 in words is "seventy-eight trillion, three hundred ten billion, five hundred three million, one hundred five thousand, seven hundred eighty-five".