86661057 has 12 divisors (see below), whose sum is σ = 134413296. Its totient is φ = 49520520.

The previous prime is 86661049. The next prime is 86661059. The reversal of 86661057 is 75016668.

It is not a de Polignac number, because 86661057 - 2³ = 86661049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86661059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 294619 + ... + 294912.

It is an arithmetic number, because the mean of its divisors is an integer number (11201108).

Almost surely, 2^86661057 is an apocalyptic number.

It is an amenable number.

86661057 is a deficient number, since it is larger than the sum of its proper divisors (47752239).

86661057 is a wasteful number, since it uses less digits than its factorization.

86661057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589548 (or 589541 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 86661057 is about 9309.1920702067. The cubic root of 86661057 is about 442.5285831707.

The spelling of 86661057 in words is "eighty-six million, six hundred sixty-one thousand, fifty-seven".