85722928661 has 2 divisors, whose sum is σ = 85722928662. Its totient is φ = 85722928660.

The previous prime is 85722928651. The next prime is 85722928673. The reversal of 85722928661 is 16682922758.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56922802225 + 28800126436 = 238585^2 + 169706^2 .

It is a cyclic number.

It is not a de Polignac number, because 85722928661 - 2¹⁴ = 85722912277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85722928597 and 85722928606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85722928651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42861464330 + 42861464331.

It is an arithmetic number, because the mean of its divisors is an integer number (42861464331).

Almost surely, 2^85722928661 is an apocalyptic number.

It is an amenable number.

85722928661 is a deficient number, since it is larger than the sum of its proper divisors (1).

85722928661 is an equidigital number, since it uses as much as digits as its factorization.

85722928661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5806080, while the sum is 56.

The spelling of 85722928661 in words is "eighty-five billion, seven hundred twenty-two million, nine hundred twenty-eight thousand, six hundred sixty-one".