66697270 has 16 divisors (see below), whose sum is σ = 120336480. Its totient is φ = 26616384.

The previous prime is 66697261. The next prime is 66697291. The reversal of 66697270 is 7279666.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3207 + ... + 11986.

It is an arithmetic number, because the mean of its divisors is an integer number (7521030).

Almost surely, 2^66697270 is an apocalyptic number.

66697270 is a deficient number, since it is larger than the sum of its proper divisors (53639210).

66697270 is a wasteful number, since it uses less digits than its factorization.

66697270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15639.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 66697270 is about 8166.8396580317. The cubic root of 66697270 is about 405.5421687651.

The spelling of 66697270 in words is "sixty-six million, six hundred ninety-seven thousand, two hundred seventy".