66860858 has 4 divisors (see below), whose sum is σ = 100291290. Its totient is φ = 33430428.

The previous prime is 66860821. The next prime is 66860891. The reversal of 66860858 is 85806866.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 42289009 + 24571849 = 6503^2 + 4957^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16715213 + ... + 16715216.

Almost surely, 2^66860858 is an apocalyptic number.

66860858 is a deficient number, since it is larger than the sum of its proper divisors (33430432).

66860858 is a wasteful number, since it uses less digits than its factorization.

66860858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33430431.

The product of its (nonzero) digits is 552960, while the sum is 47.

The square root of 66860858 is about 8176.8489040706. The cubic root of 66860858 is about 405.8734550248.

The spelling of 66860858 in words is "sixty-six million, eight hundred sixty thousand, eight hundred fifty-eight".