78205747281085 has 16 divisors (see below), whose sum is σ = 95035434359040. Its totient is φ = 61772249448000.

The previous prime is 78205747281071. The next prime is 78205747281113. The reversal of 78205747281085 is 58018274750287.

It is not a de Polignac number, because 78205747281085 - 2⁷ = 78205747280957 is a prime.

It is a super-2 number, since 2×78205747281085² (a number of 29 digits) contains 22 as substring.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 72588835 + ... + 73658335.

It is an arithmetic number, because the mean of its divisors is an integer number (5939714647440).

Almost surely, 2^{78205747281085} is an apocalyptic number.

It is an amenable number.

78205747281085 is a deficient number, since it is larger than the sum of its proper divisors (16829687077955).

78205747281085 is a wasteful number, since it uses less digits than its factorization.

78205747281085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254708.

The product of its (nonzero) digits is 70246400, while the sum is 64.

The spelling of 78205747281085 in words is "seventy-eight trillion, two hundred five billion, seven hundred forty-seven million, two hundred eighty-one thousand, eighty-five".