66849555 has 16 divisors (see below), whose sum is σ = 107381664. Its totient is φ = 35512320.

The previous prime is 66849539. The next prime is 66849613. The reversal of 66849555 is 55594866.

It is not a de Polignac number, because 66849555 - 2⁴ = 66849539 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4816 + ... + 12525.

It is an arithmetic number, because the mean of its divisors is an integer number (6711354).

Almost surely, 2^66849555 is an apocalyptic number.

66849555 is a deficient number, since it is larger than the sum of its proper divisors (40532109).

66849555 is a wasteful number, since it uses less digits than its factorization.

66849555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17606.

The product of its digits is 1296000, while the sum is 48.

The square root of 66849555 is about 8176.1577161892. The cubic root of 66849555 is about 405.8505824188.

The spelling of 66849555 in words is "sixty-six million, eight hundred forty-nine thousand, five hundred fifty-five".