86666643 has 18 divisors (see below), whose sum is σ = 145624284. Its totient is φ = 49523544.

The previous prime is 86666641. The next prime is 86666677. The reversal of 86666643 is 34666668.

It is not a de Polignac number, because 86666643 - 2¹ = 86666641 is a prime.

It is a super-2 number, since 2×86666643² = 15022214017778898, which contains 22 as substring.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (86666641) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 97821 + ... + 98702.

It is an arithmetic number, because the mean of its divisors is an integer number (8090238).

Almost surely, 2^86666643 is an apocalyptic number.

86666643 is a deficient number, since it is larger than the sum of its proper divisors (58957641).

86666643 is a wasteful number, since it uses less digits than its factorization.

86666643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196543 (or 196533 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 86666643 is about 9309.4920914086. The cubic root of 86666643 is about 442.5380911383.

The spelling of 86666643 in words is "eighty-six million, six hundred sixty-six thousand, six hundred forty-three".