85012891849 has 4 divisors (see below), whose sum is σ = 85013504964. Its totient is φ = 85012278736.

The previous prime is 85012891837. The next prime is 85012891891. The reversal of 85012891849 is 94819821058.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 37497611449 + 47515280400 = 193643^2 + 217980^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-85012891849 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 85012891849.

It is not an unprimeable number, because it can be changed into a prime (85016891849) 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, 11259 + ... + 412495.

It is an arithmetic number, because the mean of its divisors is an integer number (21253376241).

Almost surely, 2^85012891849 is an apocalyptic number.

It is an amenable number.

85012891849 is a deficient number, since it is larger than the sum of its proper divisors (613115).

85012891849 is a wasteful number, since it uses less digits than its factorization.

85012891849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613114.

The product of its (nonzero) digits is 1658880, while the sum is 55.

The spelling of 85012891849 in words is "eighty-five billion, twelve million, eight hundred ninety-one thousand, eight hundred forty-nine".