85784156821 has 8 divisors (see below), whose sum is σ = 93714717600. Its totient is φ = 77875596240.

The previous prime is 85784156791. The next prime is 85784156839. The reversal of 85784156821 is 12865148758.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85784156821 - 2⁵ = 85784156789 is a prime.

It is a super-2 number, since 2×85784156821² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85784156891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5491891 + ... + 5507488.

It is an arithmetic number, because the mean of its divisors is an integer number (11714339700).

Almost surely, 2^85784156821 is an apocalyptic number.

It is an amenable number.

85784156821 is a deficient number, since it is larger than the sum of its proper divisors (7930560779).

85784156821 is a wasteful number, since it uses less digits than its factorization.

85784156821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11000099.

The product of its digits is 4300800, while the sum is 55.

The spelling of 85784156821 in words is "eighty-five billion, seven hundred eighty-four million, one hundred fifty-six thousand, eight hundred twenty-one".