85366621 has 2 divisors, whose sum is σ = 85366622. Its totient is φ = 85366620.

The previous prime is 85366613. The next prime is 85366649. The reversal of 85366621 is 12666358.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59752900 + 25613721 = 7730^2 + 5061^2 .

It is a cyclic number.

It is not a de Polignac number, because 85366621 - 2³ = 85366613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85366661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42683310 + 42683311.

It is an arithmetic number, because the mean of its divisors is an integer number (42683311).

Almost surely, 2^85366621 is an apocalyptic number.

It is an amenable number.

85366621 is a deficient number, since it is larger than the sum of its proper divisors (1).

85366621 is an equidigital number, since it uses as much as digits as its factorization.

85366621 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 37.

The square root of 85366621 is about 9239.4058791678. The cubic root of 85366621 is about 440.3142056676.

The spelling of 85366621 in words is "eighty-five million, three hundred sixty-six thousand, six hundred twenty-one".