66694355 has 16 divisors (see below), whose sum is σ = 98503104. Its totient is φ = 42215040.

The previous prime is 66694339. The next prime is 66694373. The reversal of 66694355 is 55349666.

It is not a de Polignac number, because 66694355 - 2⁴ = 66694339 is a prime.

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 in 15 ways as a sum of consecutive naturals, for example, 72836 + ... + 73745.

It is an arithmetic number, because the mean of its divisors is an integer number (6156444).

Almost surely, 2^66694355 is an apocalyptic number.

66694355 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

66694355 is a deficient number, since it is larger than the sum of its proper divisors (31808749).

66694355 is a wasteful number, since it uses less digits than its factorization.

66694355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146606.

The product of its digits is 583200, while the sum is 44.

The square root of 66694355 is about 8166.6611904744. The cubic root of 66694355 is about 405.5362606140.

The spelling of 66694355 in words is "sixty-six million, six hundred ninety-four thousand, three hundred fifty-five".