85669632661 has 2 divisors, whose sum is σ = 85669632662. Its totient is φ = 85669632660.

The previous prime is 85669632563. The next prime is 85669632679. The reversal of 85669632661 is 16623696658.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72463256100 + 13206376561 = 269190^2 + 114919^2 .

It is a cyclic number.

It is not a de Polignac number, because 85669632661 - 2²⁷ = 85535414933 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85669632596 and 85669632605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85669432661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42834816330 + 42834816331.

It is an arithmetic number, because the mean of its divisors is an integer number (42834816331).

Almost surely, 2^85669632661 is an apocalyptic number.

It is an amenable number.

85669632661 is a deficient number, since it is larger than the sum of its proper divisors (1).

85669632661 is an equidigital number, since it uses as much as digits as its factorization.

85669632661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16796160, while the sum is 58.

The spelling of 85669632661 in words is "eighty-five billion, six hundred sixty-nine million, six hundred thirty-two thousand, six hundred sixty-one".