86666473 has 2 divisors, whose sum is σ = 86666474. Its totient is φ = 86666472.

The previous prime is 86666423. The next prime is 86666479. The reversal of 86666473 is 37466668.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62773929 + 23892544 = 7923^2 + 4888^2 .

It is a cyclic number.

It is not a de Polignac number, because 86666473 - 2⁹ = 86665961 is a prime.

It is a super-2 number, since 2×86666473² = 15022155084519458, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (86666479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43333236 + 43333237.

It is an arithmetic number, because the mean of its divisors is an integer number (43333237).

Almost surely, 2^86666473 is an apocalyptic number.

It is an amenable number.

86666473 is a deficient number, since it is larger than the sum of its proper divisors (1).

86666473 is an equidigital number, since it uses as much as digits as its factorization.

86666473 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 46.

The square root of 86666473 is about 9309.4829609383. The cubic root of 86666473 is about 442.5378017862.

The spelling of 86666473 in words is "eighty-six million, six hundred sixty-six thousand, four hundred seventy-three".