78101010505285 has 4 divisors (see below), whose sum is σ = 93721212606348. Its totient is φ = 62480808404224.

The previous prime is 78101010505283. The next prime is 78101010505307. The reversal of 78101010505285 is 58250501010187.

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 32190656089761 + 45910354415524 = 5673681^2 + 6775718^2 .

It is a cyclic number.

It is not a de Polignac number, because 78101010505285 - 2¹ = 78101010505283 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78101010505283) 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, 7810101050524 + ... + 7810101050533.

It is an arithmetic number, because the mean of its divisors is an integer number (23430303151587).

Almost surely, 2^{78101010505285} is an apocalyptic number.

It is an amenable number.

78101010505285 is a deficient number, since it is larger than the sum of its proper divisors (15620202101063).

78101010505285 is a wasteful number, since it uses less digits than its factorization.

78101010505285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15620202101062.

The product of its (nonzero) digits is 112000, while the sum is 43.

The spelling of 78101010505285 in words is "seventy-eight trillion, one hundred one billion, ten million, five hundred five thousand, two hundred eighty-five".