85506802661 has 12 divisors (see below), whose sum is σ = 99579286368. Its totient is φ = 73208879352.

The previous prime is 85506802637. The next prime is 85506802669. The reversal of 85506802661 is 16620860558.

It is a happy number.

It is not a de Polignac number, because 85506802661 - 2⁶ = 85506802597 is a prime.

It is a super-2 number, since 2×85506802661² (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 (85506802669) 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 11 ways as a sum of consecutive naturals, for example, 940211 + ... + 1027136.

It is an arithmetic number, because the mean of its divisors is an integer number (8298273864).

Almost surely, 2^85506802661 is an apocalyptic number.

It is an amenable number.

85506802661 is a deficient number, since it is larger than the sum of its proper divisors (14072483707).

85506802661 is a wasteful number, since it uses less digits than its factorization.

85506802661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1968248 (or 1968241 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 47.

The spelling of 85506802661 in words is "eighty-five billion, five hundred six million, eight hundred two thousand, six hundred sixty-one".