85578061636813 has 4 divisors (see below), whose sum is σ = 85580332191648. Its totient is φ = 85575791081980.

The previous prime is 85578061636777. The next prime is 85578061636829. The reversal of 85578061636813 is 31863616087558.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85578061636813 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 (85578061636853) 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, 1135220881 + ... + 1135296262.

It is an arithmetic number, because the mean of its divisors is an integer number (21395083047912).

Almost surely, 2^{85578061636813} is an apocalyptic number.

It is an amenable number.

85578061636813 is a deficient number, since it is larger than the sum of its proper divisors (2270554835).

85578061636813 is a wasteful number, since it uses less digits than its factorization.

85578061636813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2270554834.

The product of its (nonzero) digits is 174182400, while the sum is 67.

The spelling of 85578061636813 in words is "eighty-five trillion, five hundred seventy-eight billion, sixty-one million, six hundred thirty-six thousand, eight hundred thirteen".