85767661221 has 16 divisors (see below), whose sum is σ = 126039079488. Its totient is φ = 51444518400.

The previous prime is 85767661127. The next prime is 85767661229. The reversal of 85767661221 is 12216676758.

It is not a de Polignac number, because 85767661221 - 2³⁰ = 84693919397 is a prime.

It is a super-2 number, since 2×85767661221² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85767661229) 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 15 ways as a sum of consecutive naturals, for example, 13393810 + ... + 13400211.

It is an arithmetic number, because the mean of its divisors is an integer number (7877442468).

Almost surely, 2^85767661221 is an apocalyptic number.

It is an amenable number.

85767661221 is a deficient number, since it is larger than the sum of its proper divisors (40271418267).

85767661221 is a wasteful number, since it uses less digits than its factorization.

85767661221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26794132.

The product of its digits is 1693440, while the sum is 51.

The spelling of 85767661221 in words is "eighty-five billion, seven hundred sixty-seven million, six hundred sixty-one thousand, two hundred twenty-one".