85766621 has 2 divisors, whose sum is σ = 85766622. Its totient is φ = 85766620.

The previous prime is 85766579. The next prime is 85766657. The reversal of 85766621 is 12666758.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73788100 + 11978521 = 8590^2 + 3461^2 .

It is a cyclic number.

It is not a de Polignac number, because 85766621 - 2⁶ = 85766557 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85766221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42883310 + 42883311.

It is an arithmetic number, because the mean of its divisors is an integer number (42883311).

Almost surely, 2^85766621 is an apocalyptic number.

It is an amenable number.

85766621 is a deficient number, since it is larger than the sum of its proper divisors (1).

85766621 is an equidigital number, since it uses as much as digits as its factorization.

85766621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120960, while the sum is 41.

The square root of 85766621 is about 9261.0269948856. The cubic root of 85766621 is about 441.0008569801. Note that the first 3 decimals are identical.

The spelling of 85766621 in words is "eighty-five million, seven hundred sixty-six thousand, six hundred twenty-one".